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Simplifying -15 + -4r = 8r + -7 Reorder the terms: -15 + -4r = -7 + 8r Solving -15 + -4r = -7 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -15 + -4r + -8r = -7 + 8r + -8r Combine like terms: -4r + -8r = -12r -15 + -12r = -7 + 8r + -8r Combine like terms: 8r + -8r = 0 -15 + -12r = -7 + 0 -15 + -12r = -7 Add '15' to each side of the equation. -15 + 15 + -12r = -7 + 15 Combine like terms: -15 + 15 = 0 0 + -12r = -7 + 15 -12r = -7 + 15 Combine like terms: -7 + 15 = 8 -12r = 8 Divide each side by '-12'. r = -0.6666666667 Simplifying r = -0.6666666667
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