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Simplifying 139 = 3x + 7 + 5x + 12 Reorder the terms: 139 = 7 + 12 + 3x + 5x Combine like terms: 7 + 12 = 19 139 = 19 + 3x + 5x Combine like terms: 3x + 5x = 8x 139 = 19 + 8x Solving 139 = 19 + 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. 139 + -8x = 19 + 8x + -8x Combine like terms: 8x + -8x = 0 139 + -8x = 19 + 0 139 + -8x = 19 Add '-139' to each side of the equation. 139 + -139 + -8x = 19 + -139 Combine like terms: 139 + -139 = 0 0 + -8x = 19 + -139 -8x = 19 + -139 Combine like terms: 19 + -139 = -120 -8x = -120 Divide each side by '-8'. x = 15 Simplifying x = 15
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