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Simplifying 2(x + -7) + 3x = 21 Reorder the terms: 2(-7 + x) + 3x = 21 (-7 * 2 + x * 2) + 3x = 21 (-14 + 2x) + 3x = 21 Combine like terms: 2x + 3x = 5x -14 + 5x = 21 Solving -14 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 5x = 21 + 14 Combine like terms: -14 + 14 = 0 0 + 5x = 21 + 14 5x = 21 + 14 Combine like terms: 21 + 14 = 35 5x = 35 Divide each side by '5'. x = 7 Simplifying x = 7
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