9(B-20)=7B

Solution for 9(B-20)=7B equation:

Simplifying
9(B + -20) = 7B

Reorder the terms:
9(-20 + B) = 7B
(-20 * 9 + B * 9) = 7B
(-180 + 9B) = 7B

Solving
-180 + 9B = 7B

Solving for variable 'B'.

Move all terms containing B to the left, all other terms to the right.

Add '-7B' to each side of the equation.
-180 + 9B + -7B = 7B + -7B

Combine like terms: 9B + -7B = 2B
-180 + 2B = 7B + -7B

Combine like terms: 7B + -7B = 0
-180 + 2B = 0

Add '180' to each side of the equation.
-180 + 180 + 2B = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 2B = 0 + 180
2B = 0 + 180

Combine like terms: 0 + 180 = 180
2B = 180

Divide each side by '2'.
B = 90

Simplifying
B = 90