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Simplifying (3x + 10) + (4x + -20) = 90 Reorder the terms: (10 + 3x) + (4x + -20) = 90 Remove parenthesis around (10 + 3x) 10 + 3x + (4x + -20) = 90 Reorder the terms: 10 + 3x + (-20 + 4x) = 90 Remove parenthesis around (-20 + 4x) 10 + 3x + -20 + 4x = 90 Reorder the terms: 10 + -20 + 3x + 4x = 90 Combine like terms: 10 + -20 = -10 -10 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x -10 + 7x = 90 Solving -10 + 7x = 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 + 7x = 90 + 10 Combine like terms: -10 + 10 = 0 0 + 7x = 90 + 10 7x = 90 + 10 Combine like terms: 90 + 10 = 100 7x = 100 Divide each side by '7'. x = 14.28571429 Simplifying x = 14.28571429
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