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Simplifying s = x(20 + -2x) + x(20 + -2x) + x(40 + -2x) + 20 + -2x(40 + -2x) s = (20 * x + -2x * x) + x(20 + -2x) + x(40 + -2x) + 20 + -2x(40 + -2x) s = (20x + -2x2) + x(20 + -2x) + x(40 + -2x) + 20 + -2x(40 + -2x) s = 20x + -2x2 + (20 * x + -2x * x) + x(40 + -2x) + 20 + -2x(40 + -2x) s = 20x + -2x2 + (20x + -2x2) + x(40 + -2x) + 20 + -2x(40 + -2x) s = 20x + -2x2 + 20x + -2x2 + (40 * x + -2x * x) + 20 + -2x(40 + -2x) s = 20x + -2x2 + 20x + -2x2 + (40x + -2x2) + 20 + -2x(40 + -2x) s = 20x + -2x2 + 20x + -2x2 + 40x + -2x2 + 20 + (40 * -2x + -2x * -2x) s = 20x + -2x2 + 20x + -2x2 + 40x + -2x2 + 20 + (-80x + 4x2) Reorder the terms: s = 20 + 20x + 20x + 40x + -80x + -2x2 + -2x2 + -2x2 + 4x2 Combine like terms: 20x + 20x = 40x s = 20 + 40x + 40x + -80x + -2x2 + -2x2 + -2x2 + 4x2 Combine like terms: 40x + 40x = 80x s = 20 + 80x + -80x + -2x2 + -2x2 + -2x2 + 4x2 Combine like terms: 80x + -80x = 0 s = 20 + 0 + -2x2 + -2x2 + -2x2 + 4x2 s = 20 + -2x2 + -2x2 + -2x2 + 4x2 Combine like terms: -2x2 + -2x2 = -4x2 s = 20 + -4x2 + -2x2 + 4x2 Combine like terms: -4x2 + -2x2 = -6x2 s = 20 + -6x2 + 4x2 Combine like terms: -6x2 + 4x2 = -2x2 s = 20 + -2x2 Solving s = 20 + -2x2 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Simplifying s = 20 + -2x2
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