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Simplifying 7x + 30 + -4x = 12 Reorder the terms: 30 + 7x + -4x = 12 Combine like terms: 7x + -4x = 3x 30 + 3x = 12 Solving 30 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 3x = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = 12 + -30 3x = 12 + -30 Combine like terms: 12 + -30 = -18 3x = -18 Divide each side by '3'. x = -6 Simplifying x = -6
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