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Simplifying 12 + 9 = 42x + 28 Combine like terms: 12 + 9 = 21 21 = 42x + 28 Reorder the terms: 21 = 28 + 42x Solving 21 = 28 + 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. 21 + -42x = 28 + 42x + -42x Combine like terms: 42x + -42x = 0 21 + -42x = 28 + 0 21 + -42x = 28 Add '-21' to each side of the equation. 21 + -21 + -42x = 28 + -21 Combine like terms: 21 + -21 = 0 0 + -42x = 28 + -21 -42x = 28 + -21 Combine like terms: 28 + -21 = 7 -42x = 7 Divide each side by '-42'. x = -0.1666666667 Simplifying x = -0.1666666667
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