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Simplifying x2 + -1(x2 + -4x + 4) = 40 Reorder the terms: x2 + -1(4 + -4x + x2) = 40 x2 + (4 * -1 + -4x * -1 + x2 * -1) = 40 x2 + (-4 + 4x + -1x2) = 40 Reorder the terms: -4 + 4x + x2 + -1x2 = 40 Combine like terms: x2 + -1x2 = 0 -4 + 4x + 0 = 40 -4 + 4x = 40 Solving -4 + 4x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 4x = 40 + 4 Combine like terms: -4 + 4 = 0 0 + 4x = 40 + 4 4x = 40 + 4 Combine like terms: 40 + 4 = 44 4x = 44 Divide each side by '4'. x = 11 Simplifying x = 11
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