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Simplifying 3(2r + -4) + -8r = 0 Reorder the terms: 3(-4 + 2r) + -8r = 0 (-4 * 3 + 2r * 3) + -8r = 0 (-12 + 6r) + -8r = 0 Combine like terms: 6r + -8r = -2r -12 + -2r = 0 Solving -12 + -2r = 0 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 + -2r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -2r = 0 + 12 -2r = 0 + 12 Combine like terms: 0 + 12 = 12 -2r = 12 Divide each side by '-2'. r = -6 Simplifying r = -6
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