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Simplifying -57 = 3(-4 + r) -57 = (-4 * 3 + r * 3) -57 = (-12 + 3r) Solving -57 = -12 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -57 + -3r = -12 + 3r + -3r Combine like terms: 3r + -3r = 0 -57 + -3r = -12 + 0 -57 + -3r = -12 Add '57' to each side of the equation. -57 + 57 + -3r = -12 + 57 Combine like terms: -57 + 57 = 0 0 + -3r = -12 + 57 -3r = -12 + 57 Combine like terms: -12 + 57 = 45 -3r = 45 Divide each side by '-3'. r = -15 Simplifying r = -15
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