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Simplifying 189 = -7x + 42x + -21 Reorder the terms: 189 = -21 + -7x + 42x Combine like terms: -7x + 42x = 35x 189 = -21 + 35x Solving 189 = -21 + 35x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35x' to each side of the equation. 189 + -35x = -21 + 35x + -35x Combine like terms: 35x + -35x = 0 189 + -35x = -21 + 0 189 + -35x = -21 Add '-189' to each side of the equation. 189 + -189 + -35x = -21 + -189 Combine like terms: 189 + -189 = 0 0 + -35x = -21 + -189 -35x = -21 + -189 Combine like terms: -21 + -189 = -210 -35x = -210 Divide each side by '-35'. x = 6 Simplifying x = 6
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