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Simplifying -7 = (5 + r) Remove parenthesis around (5 + r) -7 = 5 + r Solving -7 = 5 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -7 + -1r = 5 + r + -1r Combine like terms: r + -1r = 0 -7 + -1r = 5 + 0 -7 + -1r = 5 Add '7' to each side of the equation. -7 + 7 + -1r = 5 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = 5 + 7 -1r = 5 + 7 Combine like terms: 5 + 7 = 12 -1r = 12 Divide each side by '-1'. r = -12 Simplifying r = -12
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