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Simplifying -25 + 2r = -1(7 + r) -25 + 2r = (7 * -1 + r * -1) -25 + 2r = (-7 + -1r) Solving -25 + 2r = -7 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -25 + 2r + r = -7 + -1r + r Combine like terms: 2r + r = 3r -25 + 3r = -7 + -1r + r Combine like terms: -1r + r = 0 -25 + 3r = -7 + 0 -25 + 3r = -7 Add '25' to each side of the equation. -25 + 25 + 3r = -7 + 25 Combine like terms: -25 + 25 = 0 0 + 3r = -7 + 25 3r = -7 + 25 Combine like terms: -7 + 25 = 18 3r = 18 Divide each side by '3'. r = 6 Simplifying r = 6
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