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Simplifying 2 + -1(-1r) = 4(5 + -1r) Remove parenthesis around (-1r) 2 + -1 * -1r = 4(5 + -1r) Multiply -1 * -1 2 + 1r = 4(5 + -1r) 2 + 1r = (5 * 4 + -1r * 4) 2 + 1r = (20 + -4r) Solving 2 + 1r = 20 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 2 + 1r + 4r = 20 + -4r + 4r Combine like terms: 1r + 4r = 5r 2 + 5r = 20 + -4r + 4r Combine like terms: -4r + 4r = 0 2 + 5r = 20 + 0 2 + 5r = 20 Add '-2' to each side of the equation. 2 + -2 + 5r = 20 + -2 Combine like terms: 2 + -2 = 0 0 + 5r = 20 + -2 5r = 20 + -2 Combine like terms: 20 + -2 = 18 5r = 18 Divide each side by '5'. r = 3.6 Simplifying r = 3.6
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