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Simplifying (3 + -2r) = 7 Remove parenthesis around (3 + -2r) 3 + -2r = 7 Solving 3 + -2r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2r = 7 + -3 Combine like terms: 3 + -3 = 0 0 + -2r = 7 + -3 -2r = 7 + -3 Combine like terms: 7 + -3 = 4 -2r = 4 Divide each side by '-2'. r = -2 Simplifying r = -2
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