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Simplifying 7x + -1(2x + 7) + 15 = 3x Reorder the terms: 7x + -1(7 + 2x) + 15 = 3x 7x + (7 * -1 + 2x * -1) + 15 = 3x 7x + (-7 + -2x) + 15 = 3x Reorder the terms: -7 + 15 + 7x + -2x = 3x Combine like terms: -7 + 15 = 8 8 + 7x + -2x = 3x Combine like terms: 7x + -2x = 5x 8 + 5x = 3x Solving 8 + 5x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 8 + 5x + -3x = 3x + -3x Combine like terms: 5x + -3x = 2x 8 + 2x = 3x + -3x Combine like terms: 3x + -3x = 0 8 + 2x = 0 Add '-8' to each side of the equation. 8 + -8 + 2x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 2x = 0 + -8 2x = 0 + -8 Combine like terms: 0 + -8 = -8 2x = -8 Divide each side by '2'. x = -4 Simplifying x = -4
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