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Simplifying (6 + -18x) + -1(3x + 90) = 0 Remove parenthesis around (6 + -18x) 6 + -18x + -1(3x + 90) = 0 Reorder the terms: 6 + -18x + -1(90 + 3x) = 0 6 + -18x + (90 * -1 + 3x * -1) = 0 6 + -18x + (-90 + -3x) = 0 Reorder the terms: 6 + -90 + -18x + -3x = 0 Combine like terms: 6 + -90 = -84 -84 + -18x + -3x = 0 Combine like terms: -18x + -3x = -21x -84 + -21x = 0 Solving -84 + -21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + -21x = 0 + 84 Combine like terms: -84 + 84 = 0 0 + -21x = 0 + 84 -21x = 0 + 84 Combine like terms: 0 + 84 = 84 -21x = 84 Divide each side by '-21'. x = -4 Simplifying x = -4
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