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Simplifying 3(x + 7) + -1 = 18 Reorder the terms: 3(7 + x) + -1 = 18 (7 * 3 + x * 3) + -1 = 18 (21 + 3x) + -1 = 18 Reorder the terms: 21 + -1 + 3x = 18 Combine like terms: 21 + -1 = 20 20 + 3x = 18 Solving 20 + 3x = 18 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 + 3x = 18 + -20 Combine like terms: 20 + -20 = 0 0 + 3x = 18 + -20 3x = 18 + -20 Combine like terms: 18 + -20 = -2 3x = -2 Divide each side by '3'. x = -0.6666666667 Simplifying x = -0.6666666667
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