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Simplifying 7r + -15 = -7 + 9r Reorder the terms: -15 + 7r = -7 + 9r Solving -15 + 7r = -7 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -15 + 7r + -9r = -7 + 9r + -9r Combine like terms: 7r + -9r = -2r -15 + -2r = -7 + 9r + -9r Combine like terms: 9r + -9r = 0 -15 + -2r = -7 + 0 -15 + -2r = -7 Add '15' to each side of the equation. -15 + 15 + -2r = -7 + 15 Combine like terms: -15 + 15 = 0 0 + -2r = -7 + 15 -2r = -7 + 15 Combine like terms: -7 + 15 = 8 -2r = 8 Divide each side by '-2'. r = -4 Simplifying r = -4
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