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Simplifying 8(r + -4) + -1r = 86 Reorder the terms: 8(-4 + r) + -1r = 86 (-4 * 8 + r * 8) + -1r = 86 (-32 + 8r) + -1r = 86 Combine like terms: 8r + -1r = 7r -32 + 7r = 86 Solving -32 + 7r = 86 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '32' to each side of the equation. -32 + 32 + 7r = 86 + 32 Combine like terms: -32 + 32 = 0 0 + 7r = 86 + 32 7r = 86 + 32 Combine like terms: 86 + 32 = 118 7r = 118 Divide each side by '7'. r = 16.85714286 Simplifying r = 16.85714286
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