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Simplifying (2x + 9) + (6x + -7) = 66 Reorder the terms: (9 + 2x) + (6x + -7) = 66 Remove parenthesis around (9 + 2x) 9 + 2x + (6x + -7) = 66 Reorder the terms: 9 + 2x + (-7 + 6x) = 66 Remove parenthesis around (-7 + 6x) 9 + 2x + -7 + 6x = 66 Reorder the terms: 9 + -7 + 2x + 6x = 66 Combine like terms: 9 + -7 = 2 2 + 2x + 6x = 66 Combine like terms: 2x + 6x = 8x 2 + 8x = 66 Solving 2 + 8x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 8x = 66 + -2 Combine like terms: 2 + -2 = 0 0 + 8x = 66 + -2 8x = 66 + -2 Combine like terms: 66 + -2 = 64 8x = 64 Divide each side by '8'. x = 8 Simplifying x = 8
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