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Simplifying (3x + 5) + (10x + -7) = 90 Reorder the terms: (5 + 3x) + (10x + -7) = 90 Remove parenthesis around (5 + 3x) 5 + 3x + (10x + -7) = 90 Reorder the terms: 5 + 3x + (-7 + 10x) = 90 Remove parenthesis around (-7 + 10x) 5 + 3x + -7 + 10x = 90 Reorder the terms: 5 + -7 + 3x + 10x = 90 Combine like terms: 5 + -7 = -2 -2 + 3x + 10x = 90 Combine like terms: 3x + 10x = 13x -2 + 13x = 90 Solving -2 + 13x = 90 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 + 13x = 90 + 2 Combine like terms: -2 + 2 = 0 0 + 13x = 90 + 2 13x = 90 + 2 Combine like terms: 90 + 2 = 92 13x = 92 Divide each side by '13'. x = 7.076923077 Simplifying x = 7.076923077
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