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Simplifying x2 + 2x + 40 = x2 + -1x + 90 Reorder the terms: 40 + 2x + x2 = x2 + -1x + 90 Reorder the terms: 40 + 2x + x2 = 90 + -1x + x2 Add '-1x2' to each side of the equation. 40 + 2x + x2 + -1x2 = 90 + -1x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 40 + 2x + 0 = 90 + -1x + x2 + -1x2 40 + 2x = 90 + -1x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 40 + 2x = 90 + -1x + 0 40 + 2x = 90 + -1x Solving 40 + 2x = 90 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 40 + 2x + x = 90 + -1x + x Combine like terms: 2x + x = 3x 40 + 3x = 90 + -1x + x Combine like terms: -1x + x = 0 40 + 3x = 90 + 0 40 + 3x = 90 Add '-40' to each side of the equation. 40 + -40 + 3x = 90 + -40 Combine like terms: 40 + -40 = 0 0 + 3x = 90 + -40 3x = 90 + -40 Combine like terms: 90 + -40 = 50 3x = 50 Divide each side by '3'. x = 16.66666667 Simplifying x = 16.66666667
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