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Simplifying (180 + -1x) + -7(90 + -1x) = 30 Remove parenthesis around (180 + -1x) 180 + -1x + -7(90 + -1x) = 30 180 + -1x + (90 * -7 + -1x * -7) = 30 180 + -1x + (-630 + 7x) = 30 Reorder the terms: 180 + -630 + -1x + 7x = 30 Combine like terms: 180 + -630 = -450 -450 + -1x + 7x = 30 Combine like terms: -1x + 7x = 6x -450 + 6x = 30 Solving -450 + 6x = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '450' to each side of the equation. -450 + 450 + 6x = 30 + 450 Combine like terms: -450 + 450 = 0 0 + 6x = 30 + 450 6x = 30 + 450 Combine like terms: 30 + 450 = 480 6x = 480 Divide each side by '6'. x = 80 Simplifying x = 80
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