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Simplifying -4r + -7(1 + 2r) = -115 -4r + (1 * -7 + 2r * -7) = -115 -4r + (-7 + -14r) = -115 Reorder the terms: -7 + -4r + -14r = -115 Combine like terms: -4r + -14r = -18r -7 + -18r = -115 Solving -7 + -18r = -115 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -18r = -115 + 7 Combine like terms: -7 + 7 = 0 0 + -18r = -115 + 7 -18r = -115 + 7 Combine like terms: -115 + 7 = -108 -18r = -108 Divide each side by '-18'. r = 6 Simplifying r = 6
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