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Simplifying 7x + 3x + -12 = 30 Reorder the terms: -12 + 7x + 3x = 30 Combine like terms: 7x + 3x = 10x -12 + 10x = 30 Solving -12 + 10x = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 10x = 30 + 12 Combine like terms: -12 + 12 = 0 0 + 10x = 30 + 12 10x = 30 + 12 Combine like terms: 30 + 12 = 42 10x = 42 Divide each side by '10'. x = 4.2 Simplifying x = 4.2
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