Write out a linear equation with one variable so that its solution is 5 and the coefficient of the term with unknowns is 4 / 5 In a hurry

Write out a linear equation with one variable so that its solution is 5 and the coefficient of the term with unknowns is 4 / 5 In a hurry

4/5x+5=9

Ax + B = 0 and MX + n = 0 have ()
A. a2+m2＞0B. mb≥anC. mb≤anD. mb=an

(1) If a ≠ 0, then m ≠ 0, so x = − Ba = − nm. So there is MB = Na. (2) if a = 0, then there must be m = 0, then there is also MB = an

According to 105 = 105, write the equation in the form of AX = B (x + n), ax = B (x-n), ABC is the known number, X is the unknown number, and solve the equation
105=3*5*7 105=35*3 105=21*5 105=15*7

21•5=3•（5+30）
5•21=7•（21-6）

Specify a kind of operation: a × B = AB + A-B, where a and B are constants, find 2 × 3 + 1 × (- 4)

2×3+1×（-4）
=（2×3+2-3）+[1×（-4）+1-（-4）]
=5+1
=6