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Simplifying 18 = 5r + -3(7r + -4) Reorder the terms: 18 = 5r + -3(-4 + 7r) 18 = 5r + (-4 * -3 + 7r * -3) 18 = 5r + (12 + -21r) Reorder the terms: 18 = 12 + 5r + -21r Combine like terms: 5r + -21r = -16r 18 = 12 + -16r Solving 18 = 12 + -16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16r' to each side of the equation. 18 + 16r = 12 + -16r + 16r Combine like terms: -16r + 16r = 0 18 + 16r = 12 + 0 18 + 16r = 12 Add '-18' to each side of the equation. 18 + -18 + 16r = 12 + -18 Combine like terms: 18 + -18 = 0 0 + 16r = 12 + -18 16r = 12 + -18 Combine like terms: 12 + -18 = -6 16r = -6 Divide each side by '16'. r = -0.375 Simplifying r = -0.375
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