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Simplifying 4(r + -3) + -3r = -13 + -3 Reorder the terms: 4(-3 + r) + -3r = -13 + -3 (-3 * 4 + r * 4) + -3r = -13 + -3 (-12 + 4r) + -3r = -13 + -3 Combine like terms: 4r + -3r = 1r -12 + 1r = -13 + -3 Combine like terms: -13 + -3 = -16 -12 + 1r = -16 Solving -12 + 1r = -16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 1r = -16 + 12 Combine like terms: -12 + 12 = 0 0 + 1r = -16 + 12 1r = -16 + 12 Combine like terms: -16 + 12 = -4 1r = -4 Divide each side by '1'. r = -4 Simplifying r = -4
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