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Simplifying 7 + -15 * 2 = r Multiply -15 * 2 7 + -30 = r Combine like terms: 7 + -30 = -23 -23 = r Solving -23 = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -23 + -1r = r + -1r Combine like terms: r + -1r = 0 -23 + -1r = 0 Add '23' to each side of the equation. -23 + 23 + -1r = 0 + 23 Combine like terms: -23 + 23 = 0 0 + -1r = 0 + 23 -1r = 0 + 23 Combine like terms: 0 + 23 = 23 -1r = 23 Divide each side by '-1'. r = -23 Simplifying r = -23
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