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Simplifying -4r = 21 + 3r Solving -4r = 21 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -4r + -3r = 21 + 3r + -3r Combine like terms: -4r + -3r = -7r -7r = 21 + 3r + -3r Combine like terms: 3r + -3r = 0 -7r = 21 + 0 -7r = 21 Divide each side by '-7'. r = -3 Simplifying r = -3
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