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Simplifying 130 + (4x + -7) + (8x + -39) = 180 Reorder the terms: 130 + (-7 + 4x) + (8x + -39) = 180 Remove parenthesis around (-7 + 4x) 130 + -7 + 4x + (8x + -39) = 180 Reorder the terms: 130 + -7 + 4x + (-39 + 8x) = 180 Remove parenthesis around (-39 + 8x) 130 + -7 + 4x + -39 + 8x = 180 Reorder the terms: 130 + -7 + -39 + 4x + 8x = 180 Combine like terms: 130 + -7 = 123 123 + -39 + 4x + 8x = 180 Combine like terms: 123 + -39 = 84 84 + 4x + 8x = 180 Combine like terms: 4x + 8x = 12x 84 + 12x = 180 Solving 84 + 12x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 12x = 180 + -84 Combine like terms: 84 + -84 = 0 0 + 12x = 180 + -84 12x = 180 + -84 Combine like terms: 180 + -84 = 96 12x = 96 Divide each side by '12'. x = 8 Simplifying x = 8
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