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Simplifying -15 + -3r = -4(r + 2) Reorder the terms: -15 + -3r = -4(2 + r) -15 + -3r = (2 * -4 + r * -4) -15 + -3r = (-8 + -4r) Solving -15 + -3r = -8 + -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. -15 + -3r + 4r = -8 + -4r + 4r Combine like terms: -3r + 4r = 1r -15 + 1r = -8 + -4r + 4r Combine like terms: -4r + 4r = 0 -15 + 1r = -8 + 0 -15 + 1r = -8 Add '15' to each side of the equation. -15 + 15 + 1r = -8 + 15 Combine like terms: -15 + 15 = 0 0 + 1r = -8 + 15 1r = -8 + 15 Combine like terms: -8 + 15 = 7 1r = 7 Divide each side by '1'. r = 7 Simplifying r = 7
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