b=25x-81-2(1-X)(5X+9)

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Solution for b=25x-81-2(1-X)(5X+9) equation: 


Simplifying
b = 25x + -81 + -2(1 + -1X)(5X + 9)

Reorder the terms:
b = 25x + -81 + -2(1 + -1X)(9 + 5X)

Multiply (1 + -1X) * (9 + 5X)
b = 25x + -81 + -2(1(9 + 5X) + -1X * (9 + 5X))
b = 25x + -81 + -2((9 * 1 + 5X * 1) + -1X * (9 + 5X))
b = 25x + -81 + -2((9 + 5X) + -1X * (9 + 5X))
b = 25x + -81 + -2(9 + 5X + (9 * -1X + 5X * -1X))
b = 25x + -81 + -2(9 + 5X + (-9X + -5X2))

Combine like terms: 5X + -9X = -4X
b = 25x + -81 + -2(9 + -4X + -5X2)
b = 25x + -81 + (9 * -2 + -4X * -2 + -5X2 * -2)
b = 25x + -81 + (-18 + 8X + 10X2)

Reorder the terms:
b = -81 + -18 + 8X + 10X2 + 25x

Combine like terms: -81 + -18 = -99
b = -99 + 8X + 10X2 + 25x

Solving
b = -99 + 8X + 10X2 + 25x

Solving for variable 'b'.

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

Simplifying
b = -99 + 8X + 10X2 + 25x

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