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Simplifying 3x + 7x + -4 = 66 Reorder the terms: -4 + 3x + 7x = 66 Combine like terms: 3x + 7x = 10x -4 + 10x = 66 Solving -4 + 10x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 10x = 66 + 4 Combine like terms: -4 + 4 = 0 0 + 10x = 66 + 4 10x = 66 + 4 Combine like terms: 66 + 4 = 70 10x = 70 Divide each side by '10'. x = 7 Simplifying x = 7
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