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Simplifying (r + -3) + -1(4 + -2r) = 0 Reorder the terms: (-3 + r) + -1(4 + -2r) = 0 Remove parenthesis around (-3 + r) -3 + r + -1(4 + -2r) = 0 -3 + r + (4 * -1 + -2r * -1) = 0 -3 + r + (-4 + 2r) = 0 Reorder the terms: -3 + -4 + r + 2r = 0 Combine like terms: -3 + -4 = -7 -7 + r + 2r = 0 Combine like terms: r + 2r = 3r -7 + 3r = 0 Solving -7 + 3r = 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 + 3r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 3r = 0 + 7 3r = 0 + 7 Combine like terms: 0 + 7 = 7 3r = 7 Divide each side by '3'. r = 2.333333333 Simplifying r = 2.333333333
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