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Simplifying -28 + -7r = 4(-3r + -3) + 3r Reorder the terms: -28 + -7r = 4(-3 + -3r) + 3r -28 + -7r = (-3 * 4 + -3r * 4) + 3r -28 + -7r = (-12 + -12r) + 3r Combine like terms: -12r + 3r = -9r -28 + -7r = -12 + -9r Solving -28 + -7r = -12 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. -28 + -7r + 9r = -12 + -9r + 9r Combine like terms: -7r + 9r = 2r -28 + 2r = -12 + -9r + 9r Combine like terms: -9r + 9r = 0 -28 + 2r = -12 + 0 -28 + 2r = -12 Add '28' to each side of the equation. -28 + 28 + 2r = -12 + 28 Combine like terms: -28 + 28 = 0 0 + 2r = -12 + 28 2r = -12 + 28 Combine like terms: -12 + 28 = 16 2r = 16 Divide each side by '2'. r = 8 Simplifying r = 8
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