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Simplifying 7 + -3(x + 2) = 21 Reorder the terms: 7 + -3(2 + x) = 21 7 + (2 * -3 + x * -3) = 21 7 + (-6 + -3x) = 21 Combine like terms: 7 + -6 = 1 1 + -3x = 21 Solving 1 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 21 + -1 -3x = 21 + -1 Combine like terms: 21 + -1 = 20 -3x = 20 Divide each side by '-3'. x = -6.666666667 Simplifying x = -6.666666667
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