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Simplifying 4 + -1(r + -3) = 0 Reorder the terms: 4 + -1(-3 + r) = 0 4 + (-3 * -1 + r * -1) = 0 4 + (3 + -1r) = 0 Combine like terms: 4 + 3 = 7 7 + -1r = 0 Solving 7 + -1r = 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 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7
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