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Simplifying 4r + -15 = -21 + 6r Reorder the terms: -15 + 4r = -21 + 6r Solving -15 + 4r = -21 + 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. -15 + 4r + -6r = -21 + 6r + -6r Combine like terms: 4r + -6r = -2r -15 + -2r = -21 + 6r + -6r Combine like terms: 6r + -6r = 0 -15 + -2r = -21 + 0 -15 + -2r = -21 Add '15' to each side of the equation. -15 + 15 + -2r = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -2r = -21 + 15 -2r = -21 + 15 Combine like terms: -21 + 15 = -6 -2r = -6 Divide each side by '-2'. r = 3 Simplifying r = 3
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