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Simplifying 2x + -2(-2x + -18) = 90 Reorder the terms: 2x + -2(-18 + -2x) = 90 2x + (-18 * -2 + -2x * -2) = 90 2x + (36 + 4x) = 90 Reorder the terms: 36 + 2x + 4x = 90 Combine like terms: 2x + 4x = 6x 36 + 6x = 90 Solving 36 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 6x = 90 + -36 Combine like terms: 36 + -36 = 0 0 + 6x = 90 + -36 6x = 90 + -36 Combine like terms: 90 + -36 = 54 6x = 54 Divide each side by '6'. x = 9 Simplifying x = 9
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