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Simplifying 3 + -1(4 + -1r) = 7 3 + (4 * -1 + -1r * -1) = 7 3 + (-4 + 1r) = 7 Combine like terms: 3 + -4 = -1 -1 + 1r = 7 Solving -1 + 1r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1r = 7 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = 7 + 1 1r = 7 + 1 Combine like terms: 7 + 1 = 8 1r = 8 Divide each side by '1'. r = 8 Simplifying r = 8
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