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Simplifying 90 + -3x = 42x + 15 Reorder the terms: 90 + -3x = 15 + 42x Solving 90 + -3x = 15 + 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. 90 + -3x + -42x = 15 + 42x + -42x Combine like terms: -3x + -42x = -45x 90 + -45x = 15 + 42x + -42x Combine like terms: 42x + -42x = 0 90 + -45x = 15 + 0 90 + -45x = 15 Add '-90' to each side of the equation. 90 + -90 + -45x = 15 + -90 Combine like terms: 90 + -90 = 0 0 + -45x = 15 + -90 -45x = 15 + -90 Combine like terms: 15 + -90 = -75 -45x = -75 Divide each side by '-45'. x = 1.666666667 Simplifying x = 1.666666667
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