s=x(40-2x)+x(40-2x)

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Solution for s=x(40-2x)+x(40-2x) equation: 


Simplifying
s = x(40 + -2x) + x(40 + -2x)
s = (40 * x + -2x * x) + x(40 + -2x)
s = (40x + -2x2) + x(40 + -2x)
s = 40x + -2x2 + (40 * x + -2x * x)
s = 40x + -2x2 + (40x + -2x2)

Reorder the terms:
s = 40x + 40x + -2x2 + -2x2

Combine like terms: 40x + 40x = 80x
s = 80x + -2x2 + -2x2

Combine like terms: -2x2 + -2x2 = -4x2
s = 80x + -4x2

Solving
s = 80x + -4x2

Solving for variable 's'.

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

Simplifying
s = 80x + -4x2

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