S=(40-2x)(60-2x)

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Solution for S=(40-2x)(60-2x) equation: 


Simplifying
S = (40 + -2x)(60 + -2x)

Multiply (40 + -2x) * (60 + -2x)
S = (40(60 + -2x) + -2x * (60 + -2x))
S = ((60 * 40 + -2x * 40) + -2x * (60 + -2x))
S = ((2400 + -80x) + -2x * (60 + -2x))
S = (2400 + -80x + (60 * -2x + -2x * -2x))
S = (2400 + -80x + (-120x + 4x2))

Combine like terms: -80x + -120x = -200x
S = (2400 + -200x + 4x2)

Solving
S = 2400 + -200x + 4x2

Solving for variable 'S'.

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

Simplifying
S = 2400 + -200x + 4x2

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