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Simplifying -3 + 15 = 4(r + -2) Combine like terms: -3 + 15 = 12 12 = 4(r + -2) Reorder the terms: 12 = 4(-2 + r) 12 = (-2 * 4 + r * 4) 12 = (-8 + 4r) Solving 12 = -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. 12 + -4r = -8 + 4r + -4r Combine like terms: 4r + -4r = 0 12 + -4r = -8 + 0 12 + -4r = -8 Add '-12' to each side of the equation. 12 + -12 + -4r = -8 + -12 Combine like terms: 12 + -12 = 0 0 + -4r = -8 + -12 -4r = -8 + -12 Combine like terms: -8 + -12 = -20 -4r = -20 Divide each side by '-4'. r = 5 Simplifying r = 5
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