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Simplifying 7 = r + -12 Reorder the terms: 7 = -12 + r Solving 7 = -12 + 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 = -12 + r + -1r Combine like terms: r + -1r = 0 7 + -1r = -12 + 0 7 + -1r = -12 Add '-7' to each side of the equation. 7 + -7 + -1r = -12 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = -12 + -7 -1r = -12 + -7 Combine like terms: -12 + -7 = -19 -1r = -19 Divide each side by '-1'. r = 19 Simplifying r = 19
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