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Simplifying 87 + -1(7x + 6) = 7(x + 3) + x Reorder the terms: 87 + -1(6 + 7x) = 7(x + 3) + x 87 + (6 * -1 + 7x * -1) = 7(x + 3) + x 87 + (-6 + -7x) = 7(x + 3) + x Combine like terms: 87 + -6 = 81 81 + -7x = 7(x + 3) + x Reorder the terms: 81 + -7x = 7(3 + x) + x 81 + -7x = (3 * 7 + x * 7) + x 81 + -7x = (21 + 7x) + x Combine like terms: 7x + x = 8x 81 + -7x = 21 + 8x Solving 81 + -7x = 21 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 81 + -7x + -8x = 21 + 8x + -8x Combine like terms: -7x + -8x = -15x 81 + -15x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 81 + -15x = 21 + 0 81 + -15x = 21 Add '-81' to each side of the equation. 81 + -81 + -15x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -15x = 21 + -81 -15x = 21 + -81 Combine like terms: 21 + -81 = -60 -15x = -60 Divide each side by '-15'. x = 4 Simplifying x = 4
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