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Simplifying 3x(2x + -1) + -6x(7 + x) = 90 Reorder the terms: 3x(-1 + 2x) + -6x(7 + x) = 90 (-1 * 3x + 2x * 3x) + -6x(7 + x) = 90 (-3x + 6x2) + -6x(7 + x) = 90 -3x + 6x2 + (7 * -6x + x * -6x) = 90 -3x + 6x2 + (-42x + -6x2) = 90 Reorder the terms: -3x + -42x + 6x2 + -6x2 = 90 Combine like terms: -3x + -42x = -45x -45x + 6x2 + -6x2 = 90 Combine like terms: 6x2 + -6x2 = 0 -45x + 0 = 90 -45x = 90 Solving -45x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-45'. x = -2 Simplifying x = -2
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