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Simplifying 30x + -1(31 + -1x) = 810 30x + (31 * -1 + -1x * -1) = 810 30x + (-31 + 1x) = 810 Reorder the terms: -31 + 30x + 1x = 810 Combine like terms: 30x + 1x = 31x -31 + 31x = 810 Solving -31 + 31x = 810 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + 31x = 810 + 31 Combine like terms: -31 + 31 = 0 0 + 31x = 810 + 31 31x = 810 + 31 Combine like terms: 810 + 31 = 841 31x = 841 Divide each side by '31'. x = 27.12903226 Simplifying x = 27.12903226
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