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Simplifying x2 + 2x + -7 = 5 + x2 Reorder the terms: -7 + 2x + x2 = 5 + x2 Add '-1x2' to each side of the equation. -7 + 2x + x2 + -1x2 = 5 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -7 + 2x + 0 = 5 + x2 + -1x2 -7 + 2x = 5 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -7 + 2x = 5 + 0 -7 + 2x = 5 Solving -7 + 2x = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 2x = 5 + 7 Combine like terms: -7 + 7 = 0 0 + 2x = 5 + 7 2x = 5 + 7 Combine like terms: 5 + 7 = 12 2x = 12 Divide each side by '2'. x = 6 Simplifying x = 6
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