The quotient of 43 divided by a number is 8, and the remainder is 3. The equation for finding this number is [] A．43÷x－3=8 B．（43－3）÷x=8 C．8x＋3=43

The quotient of 43 divided by a number is 8, and the remainder is 3. The equation for finding this number is [] A．43÷x－3=8 B．（43－3）÷x=8 C．8x＋3=43

B and C

Divide 22.8 by the sum of a number and 0.5, the quotient is 12, find this number. (use equation solution, there must be solution, there must be set) to standard, explain the truth

Let this number be X
22.8÷(X+0.5)=12
X+0.5=22.8÷12
X+0.5=1.9
X=1.9-0.5
X=1.4

Add a certain number to both sides of a linear equation of one variable at the same time, and then multiply it to get the value of the unknown number in the equation. Try to establish a square that meets the above conditions
_ (:зゝ∠)_
Add a certain number to both sides of a linear equation of one variable at the same time, and then multiply by the number, the value of the unknown number in the equation can be obtained. Try to establish an equation that meets the above conditions

The equation x ^ 2 + 2x = - 1 is established and the solution is x = - 1
Double left and right
We get (x ^ 2 + 2x + 1) * 1 = (- 1 + 1) * 1
The solution of the original equation is x = - 1

4x-1 divided by 5 = 1-x-2 divided by 15 equation
(4x-1)÷5=1- ( x-2)÷15 - -

(4x-1)÷5=1- ( x-2)÷15
3*(4x-1)=15- ( x-2)
12x-3=15-x+2
13x=20
x=20/13