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Simplifying 7 = 3.9 + r Solving 7 = 3.9 + 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. 7 + -1r = 3.9 + r + -1r Combine like terms: r + -1r = 0 7 + -1r = 3.9 + 0 7 + -1r = 3.9 Add '-7' to each side of the equation. 7 + -7 + -1r = 3.9 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 3.9 + -7 -1r = 3.9 + -7 Combine like terms: 3.9 + -7 = -3.1 -1r = -3.1 Divide each side by '-1'. r = 3.1 Simplifying r = 3.1
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