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Simplifying 2x + -3(-7x + 5) = 123 Reorder the terms: 2x + -3(5 + -7x) = 123 2x + (5 * -3 + -7x * -3) = 123 2x + (-15 + 21x) = 123 Reorder the terms: -15 + 2x + 21x = 123 Combine like terms: 2x + 21x = 23x -15 + 23x = 123 Solving -15 + 23x = 123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 23x = 123 + 15 Combine like terms: -15 + 15 = 0 0 + 23x = 123 + 15 23x = 123 + 15 Combine like terms: 123 + 15 = 138 23x = 138 Divide each side by '23'. x = 6 Simplifying x = 6
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