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Simplifying 2(5x + -7) + 5 = 21 Reorder the terms: 2(-7 + 5x) + 5 = 21 (-7 * 2 + 5x * 2) + 5 = 21 (-14 + 10x) + 5 = 21 Reorder the terms: -14 + 5 + 10x = 21 Combine like terms: -14 + 5 = -9 -9 + 10x = 21 Solving -9 + 10x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 10x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 10x = 21 + 9 10x = 21 + 9 Combine like terms: 21 + 9 = 30 10x = 30 Divide each side by '10'. x = 3 Simplifying x = 3
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