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Simplifying -15 = 2r + -7 + -4c Reorder the terms: -15 = -7 + -4c + 2r Solving -15 = -7 + -4c + 2r Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4c' to each side of the equation. -15 + 4c = -7 + -4c + 4c + 2r Combine like terms: -4c + 4c = 0 -15 + 4c = -7 + 0 + 2r -15 + 4c = -7 + 2r Add '15' to each side of the equation. -15 + 15 + 4c = -7 + 15 + 2r Combine like terms: -15 + 15 = 0 0 + 4c = -7 + 15 + 2r 4c = -7 + 15 + 2r Combine like terms: -7 + 15 = 8 4c = 8 + 2r Divide each side by '4'. c = 2 + 0.5r Simplifying c = 2 + 0.5r
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