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Simplifying (8x + 7) + (2x + 3) = 90 Reorder the terms: (7 + 8x) + (2x + 3) = 90 Remove parenthesis around (7 + 8x) 7 + 8x + (2x + 3) = 90 Reorder the terms: 7 + 8x + (3 + 2x) = 90 Remove parenthesis around (3 + 2x) 7 + 8x + 3 + 2x = 90 Reorder the terms: 7 + 3 + 8x + 2x = 90 Combine like terms: 7 + 3 = 10 10 + 8x + 2x = 90 Combine like terms: 8x + 2x = 10x 10 + 10x = 90 Solving 10 + 10x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 10x = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 10x = 90 + -10 10x = 90 + -10 Combine like terms: 90 + -10 = 80 10x = 80 Divide each side by '10'. x = 8 Simplifying x = 8
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