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Simplifying (7x + -7) + (4x + 15) = 84 Reorder the terms: (-7 + 7x) + (4x + 15) = 84 Remove parenthesis around (-7 + 7x) -7 + 7x + (4x + 15) = 84 Reorder the terms: -7 + 7x + (15 + 4x) = 84 Remove parenthesis around (15 + 4x) -7 + 7x + 15 + 4x = 84 Reorder the terms: -7 + 15 + 7x + 4x = 84 Combine like terms: -7 + 15 = 8 8 + 7x + 4x = 84 Combine like terms: 7x + 4x = 11x 8 + 11x = 84 Solving 8 + 11x = 84 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 11x = 84 + -8 Combine like terms: 8 + -8 = 0 0 + 11x = 84 + -8 11x = 84 + -8 Combine like terms: 84 + -8 = 76 11x = 76 Divide each side by '11'. x = 6.909090909 Simplifying x = 6.909090909
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