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Simplifying -57 = -13 + 3r Solving -57 = -13 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -57 + -3r = -13 + 3r + -3r Combine like terms: 3r + -3r = 0 -57 + -3r = -13 + 0 -57 + -3r = -13 Add '57' to each side of the equation. -57 + 57 + -3r = -13 + 57 Combine like terms: -57 + 57 = 0 0 + -3r = -13 + 57 -3r = -13 + 57 Combine like terms: -13 + 57 = 44 -3r = 44 Divide each side by '-3'. r = -14.66666667 Simplifying r = -14.66666667
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