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Simplifying 3 + 4r + -7 + 8r = 4 + 2r Reorder the terms: 3 + -7 + 4r + 8r = 4 + 2r Combine like terms: 3 + -7 = -4 -4 + 4r + 8r = 4 + 2r Combine like terms: 4r + 8r = 12r -4 + 12r = 4 + 2r Solving -4 + 12r = 4 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -4 + 12r + -2r = 4 + 2r + -2r Combine like terms: 12r + -2r = 10r -4 + 10r = 4 + 2r + -2r Combine like terms: 2r + -2r = 0 -4 + 10r = 4 + 0 -4 + 10r = 4 Add '4' to each side of the equation. -4 + 4 + 10r = 4 + 4 Combine like terms: -4 + 4 = 0 0 + 10r = 4 + 4 10r = 4 + 4 Combine like terms: 4 + 4 = 8 10r = 8 Divide each side by '10'. r = 0.8 Simplifying r = 0.8
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