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Simplifying 3x + 4x + -2(x + -10) = 90 Reorder the terms: 3x + 4x + -2(-10 + x) = 90 3x + 4x + (-10 * -2 + x * -2) = 90 3x + 4x + (20 + -2x) = 90 Reorder the terms: 20 + 3x + 4x + -2x = 90 Combine like terms: 3x + 4x = 7x 20 + 7x + -2x = 90 Combine like terms: 7x + -2x = 5x 20 + 5x = 90 Solving 20 + 5x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 5x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 5x = 90 + -20 5x = 90 + -20 Combine like terms: 90 + -20 = 70 5x = 70 Divide each side by '5'. x = 14 Simplifying x = 14
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