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Simplifying 12r + -4r + 7 = 0 Reorder the terms: 7 + 12r + -4r = 0 Combine like terms: 12r + -4r = 8r 7 + 8r = 0 Solving 7 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 8r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 8r = 0 + -7 8r = 0 + -7 Combine like terms: 0 + -7 = -7 8r = -7 Divide each side by '8'. r = -0.875 Simplifying r = -0.875
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