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Simplifying 72x + -1(21 + x) = 83 72x + (21 * -1 + x * -1) = 83 72x + (-21 + -1x) = 83 Reorder the terms: -21 + 72x + -1x = 83 Combine like terms: 72x + -1x = 71x -21 + 71x = 83 Solving -21 + 71x = 83 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 71x = 83 + 21 Combine like terms: -21 + 21 = 0 0 + 71x = 83 + 21 71x = 83 + 21 Combine like terms: 83 + 21 = 104 71x = 104 Divide each side by '71'. x = 1.464788732 Simplifying x = 1.464788732
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