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Simplifying 660 = 2(3.14) * 50 + 2r Multiply 2 * 3.14 660 = 6.28 * 50 + 2r Multiply 6.28 * 50 660 = 314 + 2r Solving 660 = 314 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 660 + -2r = 314 + 2r + -2r Combine like terms: 2r + -2r = 0 660 + -2r = 314 + 0 660 + -2r = 314 Add '-660' to each side of the equation. 660 + -660 + -2r = 314 + -660 Combine like terms: 660 + -660 = 0 0 + -2r = 314 + -660 -2r = 314 + -660 Combine like terms: 314 + -660 = -346 -2r = -346 Divide each side by '-2'. r = 173 Simplifying r = 173
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