2(3-x)-4(2x+5)=6-7(2-3x)

2(3-x)-4(2x+5)=6-7(2-3x)


2(3-x)-4(2x+5)=6-7(2-3x)
Get rid of the brackets
6-2x-8x-20=6-14+21x
-31x=6
x=-6/31



What is the sum of the coefficients of all terms in the expansion of (3x ^ 2-1 / (√ x)) ∧ 7


When x = 1
Each term is equal to his coefficient
So x = 1
Coefficient sum = (3-1) ^ 7 = 128



-What's the coefficient of the second power of 2x cubic y, and how many times


The coefficient is - 2 and the number is 3 + 2 = 5