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Simplifying x + 2(3x + -7) = 21 Reorder the terms: x + 2(-7 + 3x) = 21 x + (-7 * 2 + 3x * 2) = 21 x + (-14 + 6x) = 21 Reorder the terms: -14 + x + 6x = 21 Combine like terms: x + 6x = 7x -14 + 7x = 21 Solving -14 + 7x = 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 + 7x = 21 + 14 Combine like terms: -14 + 14 = 0 0 + 7x = 21 + 14 7x = 21 + 14 Combine like terms: 21 + 14 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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