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Simplifying 3x + 7x + -7 = 21 Reorder the terms: -7 + 3x + 7x = 21 Combine like terms: 3x + 7x = 10x -7 + 10x = 21 Solving -7 + 10x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 10x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 10x = 21 + 7 10x = 21 + 7 Combine like terms: 21 + 7 = 28 10x = 28 Divide each side by '10'. x = 2.8 Simplifying x = 2.8
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