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Simplifying 18 = 6x + (x + -13) Reorder the terms: 18 = 6x + (-13 + x) Remove parenthesis around (-13 + x) 18 = 6x + -13 + x Reorder the terms: 18 = -13 + 6x + x Combine like terms: 6x + x = 7x 18 = -13 + 7x Solving 18 = -13 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 18 + -7x = -13 + 7x + -7x Combine like terms: 7x + -7x = 0 18 + -7x = -13 + 0 18 + -7x = -13 Add '-18' to each side of the equation. 18 + -18 + -7x = -13 + -18 Combine like terms: 18 + -18 = 0 0 + -7x = -13 + -18 -7x = -13 + -18 Combine like terms: -13 + -18 = -31 -7x = -31 Divide each side by '-7'. x = 4.428571429 Simplifying x = 4.428571429
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