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Simplifying -139 + -9x = 10x + 21 Reorder the terms: -139 + -9x = 21 + 10x Solving -139 + -9x = 21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -139 + -9x + -10x = 21 + 10x + -10x Combine like terms: -9x + -10x = -19x -139 + -19x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 -139 + -19x = 21 + 0 -139 + -19x = 21 Add '139' to each side of the equation. -139 + 139 + -19x = 21 + 139 Combine like terms: -139 + 139 = 0 0 + -19x = 21 + 139 -19x = 21 + 139 Combine like terms: 21 + 139 = 160 -19x = 160 Divide each side by '-19'. x = -8.421052632 Simplifying x = -8.421052632
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