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