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Simplifying 2(r + -4) = 5[r + (-7)] Reorder the terms: 2(-4 + r) = 5[r + (-7)] (-4 * 2 + r * 2) = 5[r + (-7)] (-8 + 2r) = 5[r + (-7)] -8 + 2r = 5[r + -7] Reorder the terms: -8 + 2r = 5[-7 + r] -8 + 2r = [-7 * 5 + r * 5] -8 + 2r = [-35 + 5r] Solving -8 + 2r = -35 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. -8 + 2r + -5r = -35 + 5r + -5r Combine like terms: 2r + -5r = -3r -8 + -3r = -35 + 5r + -5r Combine like terms: 5r + -5r = 0 -8 + -3r = -35 + 0 -8 + -3r = -35 Add '8' to each side of the equation. -8 + 8 + -3r = -35 + 8 Combine like terms: -8 + 8 = 0 0 + -3r = -35 + 8 -3r = -35 + 8 Combine like terms: -35 + 8 = -27 -3r = -27 Divide each side by '-3'. r = 9 Simplifying r = 9
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