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Simplifying -3r + -4 = 56 + 9r Reorder the terms: -4 + -3r = 56 + 9r Solving -4 + -3r = 56 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -4 + -3r + -9r = 56 + 9r + -9r Combine like terms: -3r + -9r = -12r -4 + -12r = 56 + 9r + -9r Combine like terms: 9r + -9r = 0 -4 + -12r = 56 + 0 -4 + -12r = 56 Add '4' to each side of the equation. -4 + 4 + -12r = 56 + 4 Combine like terms: -4 + 4 = 0 0 + -12r = 56 + 4 -12r = 56 + 4 Combine like terms: 56 + 4 = 60 -12r = 60 Divide each side by '-12'. r = -5 Simplifying r = -5
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