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Simplifying 2r + -18 = 4r Reorder the terms: -18 + 2r = 4r Solving -18 + 2r = 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. -18 + 2r + -4r = 4r + -4r Combine like terms: 2r + -4r = -2r -18 + -2r = 4r + -4r Combine like terms: 4r + -4r = 0 -18 + -2r = 0 Add '18' to each side of the equation. -18 + 18 + -2r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -2r = 0 + 18 -2r = 0 + 18 Combine like terms: 0 + 18 = 18 -2r = 18 Divide each side by '-2'. r = -9 Simplifying r = -9
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