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Simplifying -1x2 + 4x + 7 = -1x2 + -9 Reorder the terms: 7 + 4x + -1x2 = -1x2 + -9 Reorder the terms: 7 + 4x + -1x2 = -9 + -1x2 Add 'x2' to each side of the equation. 7 + 4x + -1x2 + x2 = -9 + -1x2 + x2 Combine like terms: -1x2 + x2 = 0 7 + 4x + 0 = -9 + -1x2 + x2 7 + 4x = -9 + -1x2 + x2 Combine like terms: -1x2 + x2 = 0 7 + 4x = -9 + 0 7 + 4x = -9 Solving 7 + 4x = -9 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 + 4x = -9 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = -9 + -7 4x = -9 + -7 Combine like terms: -9 + -7 = -16 4x = -16 Divide each side by '4'. x = -4 Simplifying x = -4
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