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Simplifying 1100 + -1r = 400 + 10r Solving 1100 + -1r = 400 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. 1100 + -1r + -10r = 400 + 10r + -10r Combine like terms: -1r + -10r = -11r 1100 + -11r = 400 + 10r + -10r Combine like terms: 10r + -10r = 0 1100 + -11r = 400 + 0 1100 + -11r = 400 Add '-1100' to each side of the equation. 1100 + -1100 + -11r = 400 + -1100 Combine like terms: 1100 + -1100 = 0 0 + -11r = 400 + -1100 -11r = 400 + -1100 Combine like terms: 400 + -1100 = -700 -11r = -700 Divide each side by '-11'. r = 63.63636364 Simplifying r = 63.63636364
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