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Simplifying 6x + -13 + 2(3x + 12) = 90 Reorder the terms: 6x + -13 + 2(12 + 3x) = 90 6x + -13 + (12 * 2 + 3x * 2) = 90 6x + -13 + (24 + 6x) = 90 Reorder the terms: -13 + 24 + 6x + 6x = 90 Combine like terms: -13 + 24 = 11 11 + 6x + 6x = 90 Combine like terms: 6x + 6x = 12x 11 + 12x = 90 Solving 11 + 12x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + 12x = 90 + -11 Combine like terms: 11 + -11 = 0 0 + 12x = 90 + -11 12x = 90 + -11 Combine like terms: 90 + -11 = 79 12x = 79 Divide each side by '12'. x = 6.583333333 Simplifying x = 6.583333333
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