Question

Just need someone to explain how

I simplified it to -2a+15b/ 4

Answer 1

X = 1/4 ?

since multiplying fractions is straight across,

1/4 * (15b -2a) would result in the simplification you got.

Answer 2

Explanation:

3(4a + 6b) = 3*4a + 3*6b = 12a + 18b

-2(7a + b) = -2*7a + (-2)*b = -14a - 2b

`(5[3(4a+6b)-2(7a+b)-b])/(20)=(5[12a+18b-14a-2b-b])/(20)\\\\ (5[-2a+15b])/(20)=(15b-2a)/(4)`

x =1/4