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Simplifying 2x + -4(5x + 9) = 90 Reorder the terms: 2x + -4(9 + 5x) = 90 2x + (9 * -4 + 5x * -4) = 90 2x + (-36 + -20x) = 90 Reorder the terms: -36 + 2x + -20x = 90 Combine like terms: 2x + -20x = -18x -36 + -18x = 90 Solving -36 + -18x = 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 + -18x = 90 + 36 Combine like terms: -36 + 36 = 0 0 + -18x = 90 + 36 -18x = 90 + 36 Combine like terms: 90 + 36 = 126 -18x = 126 Divide each side by '-18'. x = -7 Simplifying x = -7
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