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Simplifying 4 = 4 + -7r + -5r Combine like terms: -7r + -5r = -12r 4 = 4 + -12r Add '-4' to each side of the equation. 4 + -4 = 4 + -4 + -12r Combine like terms: 4 + -4 = 0 0 = 4 + -4 + -12r Combine like terms: 4 + -4 = 0 0 = 0 + -12r 0 = -12r Solving 0 = -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 0 + 12r = -12r + 12r Remove the zero: 12r = -12r + 12r Combine like terms: -12r + 12r = 0 12r = 0 Divide each side by '12'. r = 0 Simplifying r = 0
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