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Simplifying -21 = 4(9r + -8) Reorder the terms: -21 = 4(-8 + 9r) -21 = (-8 * 4 + 9r * 4) -21 = (-32 + 36r) Solving -21 = -32 + 36r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-36r' to each side of the equation. -21 + -36r = -32 + 36r + -36r Combine like terms: 36r + -36r = 0 -21 + -36r = -32 + 0 -21 + -36r = -32 Add '21' to each side of the equation. -21 + 21 + -36r = -32 + 21 Combine like terms: -21 + 21 = 0 0 + -36r = -32 + 21 -36r = -32 + 21 Combine like terms: -32 + 21 = -11 -36r = -11 Divide each side by '-36'. r = 0.3055555556 Simplifying r = 0.3055555556
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