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Simplifying -1 = 7x + -20 + 8x Reorder the terms: -1 = -20 + 7x + 8x Combine like terms: 7x + 8x = 15x -1 = -20 + 15x Solving -1 = -20 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. -1 + -15x = -20 + 15x + -15x Combine like terms: 15x + -15x = 0 -1 + -15x = -20 + 0 -1 + -15x = -20 Add '1' to each side of the equation. -1 + 1 + -15x = -20 + 1 Combine like terms: -1 + 1 = 0 0 + -15x = -20 + 1 -15x = -20 + 1 Combine like terms: -20 + 1 = -19 -15x = -19 Divide each side by '-15'. x = 1.266666667 Simplifying x = 1.266666667
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