18=7(b-1)+4(1-7b)

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Solution for 18=7(b-1)+4(1-7b) equation:


Simplifying
18 = 7(b + -1) + 4(1 + -7b)

Reorder the terms:
18 = 7(-1 + b) + 4(1 + -7b)
18 = (-1 * 7 + b * 7) + 4(1 + -7b)
18 = (-7 + 7b) + 4(1 + -7b)
18 = -7 + 7b + (1 * 4 + -7b * 4)
18 = -7 + 7b + (4 + -28b)

Reorder the terms:
18 = -7 + 4 + 7b + -28b

Combine like terms: -7 + 4 = -3
18 = -3 + 7b + -28b

Combine like terms: 7b + -28b = -21b
18 = -3 + -21b

Solving
18 = -3 + -21b

Solving for variable 'b'.

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

Add '21b' to each side of the equation.
18 + 21b = -3 + -21b + 21b

Combine like terms: -21b + 21b = 0
18 + 21b = -3 + 0
18 + 21b = -3

Add '-18' to each side of the equation.
18 + -18 + 21b = -3 + -18

Combine like terms: 18 + -18 = 0
0 + 21b = -3 + -18
21b = -3 + -18

Combine like terms: -3 + -18 = -21
21b = -21

Divide each side by '21'.
b = -1

Simplifying
b = -1

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