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Simplifying -7r + -3(4 + -2r) + -3 = 0 -7r + (4 * -3 + -2r * -3) + -3 = 0 -7r + (-12 + 6r) + -3 = 0 Reorder the terms: -12 + -3 + -7r + 6r = 0 Combine like terms: -12 + -3 = -15 -15 + -7r + 6r = 0 Combine like terms: -7r + 6r = -1r -15 + -1r = 0 Solving -15 + -1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1r = 0 + 15 -1r = 0 + 15 Combine like terms: 0 + 15 = 15 -1r = 15 Divide each side by '-1'. r = -15 Simplifying r = -15
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