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Simplifying x2 + 2x + -15 = x2 + 4x + -5 Reorder the terms: -15 + 2x + x2 = x2 + 4x + -5 Reorder the terms: -15 + 2x + x2 = -5 + 4x + x2 Add '-1x2' to each side of the equation. -15 + 2x + x2 + -1x2 = -5 + 4x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -15 + 2x + 0 = -5 + 4x + x2 + -1x2 -15 + 2x = -5 + 4x + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -15 + 2x = -5 + 4x + 0 -15 + 2x = -5 + 4x Solving -15 + 2x = -5 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -15 + 2x + -4x = -5 + 4x + -4x Combine like terms: 2x + -4x = -2x -15 + -2x = -5 + 4x + -4x Combine like terms: 4x + -4x = 0 -15 + -2x = -5 + 0 -15 + -2x = -5 Add '15' to each side of the equation. -15 + 15 + -2x = -5 + 15 Combine like terms: -15 + 15 = 0 0 + -2x = -5 + 15 -2x = -5 + 15 Combine like terms: -5 + 15 = 10 -2x = 10 Divide each side by '-2'. x = -5 Simplifying x = -5
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