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Simplifying -12 + 7(x + 3) = -2r + 7 Reorder the terms: -12 + 7(3 + x) = -2r + 7 -12 + (3 * 7 + x * 7) = -2r + 7 -12 + (21 + 7x) = -2r + 7 Combine like terms: -12 + 21 = 9 9 + 7x = -2r + 7 Reorder the terms: 9 + 7x = 7 + -2r Solving 9 + 7x = 7 + -2r Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 7x = 7 + -9 + -2r Combine like terms: 9 + -9 = 0 0 + 7x = 7 + -9 + -2r 7x = 7 + -9 + -2r Combine like terms: 7 + -9 = -2 7x = -2 + -2r Divide each side by '7'. x = -0.2857142857 + -0.2857142857r Simplifying x = -0.2857142857 + -0.2857142857r
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