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Simplifying 4r + -3(2r + -10) = 20 Reorder the terms: 4r + -3(-10 + 2r) = 20 4r + (-10 * -3 + 2r * -3) = 20 4r + (30 + -6r) = 20 Reorder the terms: 30 + 4r + -6r = 20 Combine like terms: 4r + -6r = -2r 30 + -2r = 20 Solving 30 + -2r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -2r = 20 + -30 Combine like terms: 30 + -30 = 0 0 + -2r = 20 + -30 -2r = 20 + -30 Combine like terms: 20 + -30 = -10 -2r = -10 Divide each side by '-2'. r = 5 Simplifying r = 5
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