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Simplifying 15 + 7x = x + -1(2x + 4) Reorder the terms: 15 + 7x = x + -1(4 + 2x) 15 + 7x = x + (4 * -1 + 2x * -1) 15 + 7x = x + (-4 + -2x) Reorder the terms: 15 + 7x = -4 + x + -2x Combine like terms: x + -2x = -1x 15 + 7x = -4 + -1x Solving 15 + 7x = -4 + -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. 15 + 7x + x = -4 + -1x + x Combine like terms: 7x + x = 8x 15 + 8x = -4 + -1x + x Combine like terms: -1x + x = 0 15 + 8x = -4 + 0 15 + 8x = -4 Add '-15' to each side of the equation. 15 + -15 + 8x = -4 + -15 Combine like terms: 15 + -15 = 0 0 + 8x = -4 + -15 8x = -4 + -15 Combine like terms: -4 + -15 = -19 8x = -19 Divide each side by '8'. x = -2.375 Simplifying x = -2.375
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