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Simplifying 21 = -5 + 4(r + -3) Reorder the terms: 21 = -5 + 4(-3 + r) 21 = -5 + (-3 * 4 + r * 4) 21 = -5 + (-12 + 4r) Combine like terms: -5 + -12 = -17 21 = -17 + 4r Solving 21 = -17 + 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. 21 + -4r = -17 + 4r + -4r Combine like terms: 4r + -4r = 0 21 + -4r = -17 + 0 21 + -4r = -17 Add '-21' to each side of the equation. 21 + -21 + -4r = -17 + -21 Combine like terms: 21 + -21 = 0 0 + -4r = -17 + -21 -4r = -17 + -21 Combine like terms: -17 + -21 = -38 -4r = -38 Divide each side by '-4'. r = 9.5 Simplifying r = 9.5
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