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Simplifying 100 = 4x + 3.14(2r) Remove parenthesis around (2r) 100 = 4x + 3.14 * 2r Multiply 3.14 * 2 100 = 4x + 6.28r Reorder the terms: 100 = 6.28r + 4x Solving 100 = 6.28r + 4x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28r' to each side of the equation. 100 + -6.28r = 6.28r + -6.28r + 4x Combine like terms: 6.28r + -6.28r = 0.00 100 + -6.28r = 0.00 + 4x 100 + -6.28r = 4x Add '-100' to each side of the equation. 100 + -100 + -6.28r = -100 + 4x Combine like terms: 100 + -100 = 0 0 + -6.28r = -100 + 4x -6.28r = -100 + 4x Divide each side by '-6.28'. r = 15.92356688 + -0.6369426752x Simplifying r = 15.92356688 + -0.6369426752x
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