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Simplifying 3(4r) + -7(-4)(r)(-1) = 0 Remove parenthesis around (4r) 3 * 4r + -7(-4)(r)(-1) = 0 Multiply 3 * 4 12r + -7(-4)(r)(-1) = 0 Reorder the terms for easier multiplication: 12r + -7 * -4 * -1r = 0 Multiply -7 * -4 12r + 28 * -1r = 0 Multiply 28 * -1 12r + -28r = 0 Combine like terms: 12r + -28r = -16r -16r = 0 Solving -16r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-16'. r = 0 Simplifying r = 0
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