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Simplifying -140 + -7x = 9x + 20 Reorder the terms: -140 + -7x = 20 + 9x Solving -140 + -7x = 20 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -140 + -7x + -9x = 20 + 9x + -9x Combine like terms: -7x + -9x = -16x -140 + -16x = 20 + 9x + -9x Combine like terms: 9x + -9x = 0 -140 + -16x = 20 + 0 -140 + -16x = 20 Add '140' to each side of the equation. -140 + 140 + -16x = 20 + 140 Combine like terms: -140 + 140 = 0 0 + -16x = 20 + 140 -16x = 20 + 140 Combine like terms: 20 + 140 = 160 -16x = 160 Divide each side by '-16'. x = -10 Simplifying x = -10
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