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Simplifying 90 = 4x + 2(7x + -9) Reorder the terms: 90 = 4x + 2(-9 + 7x) 90 = 4x + (-9 * 2 + 7x * 2) 90 = 4x + (-18 + 14x) Reorder the terms: 90 = -18 + 4x + 14x Combine like terms: 4x + 14x = 18x 90 = -18 + 18x Solving 90 = -18 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 90 + -18x = -18 + 18x + -18x Combine like terms: 18x + -18x = 0 90 + -18x = -18 + 0 90 + -18x = -18 Add '-90' to each side of the equation. 90 + -90 + -18x = -18 + -90 Combine like terms: 90 + -90 = 0 0 + -18x = -18 + -90 -18x = -18 + -90 Combine like terms: -18 + -90 = -108 -18x = -108 Divide each side by '-18'. x = 6 Simplifying x = 6
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