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Simplifying -3x + -7 + x = 8x + 20 + -7x Reorder the terms: -7 + -3x + x = 8x + 20 + -7x Combine like terms: -3x + x = -2x -7 + -2x = 8x + 20 + -7x Reorder the terms: -7 + -2x = 20 + 8x + -7x Combine like terms: 8x + -7x = 1x -7 + -2x = 20 + 1x Solving -7 + -2x = 20 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -7 + -2x + -1x = 20 + 1x + -1x Combine like terms: -2x + -1x = -3x -7 + -3x = 20 + 1x + -1x Combine like terms: 1x + -1x = 0 -7 + -3x = 20 + 0 -7 + -3x = 20 Add '7' to each side of the equation. -7 + 7 + -3x = 20 + 7 Combine like terms: -7 + 7 = 0 0 + -3x = 20 + 7 -3x = 20 + 7 Combine like terms: 20 + 7 = 27 -3x = 27 Divide each side by '-3'. x = -9 Simplifying x = -9
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