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Simplifying (3x + 13) + (5x + -7) = 90 Reorder the terms: (13 + 3x) + (5x + -7) = 90 Remove parenthesis around (13 + 3x) 13 + 3x + (5x + -7) = 90 Reorder the terms: 13 + 3x + (-7 + 5x) = 90 Remove parenthesis around (-7 + 5x) 13 + 3x + -7 + 5x = 90 Reorder the terms: 13 + -7 + 3x + 5x = 90 Combine like terms: 13 + -7 = 6 6 + 3x + 5x = 90 Combine like terms: 3x + 5x = 8x 6 + 8x = 90 Solving 6 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 8x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 8x = 90 + -6 8x = 90 + -6 Combine like terms: 90 + -6 = 84 8x = 84 Divide each side by '8'. x = 10.5 Simplifying x = 10.5
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