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Simplifying 3x + -1(x + 3) = 7 Reorder the terms: 3x + -1(3 + x) = 7 3x + (3 * -1 + x * -1) = 7 3x + (-3 + -1x) = 7 Reorder the terms: -3 + 3x + -1x = 7 Combine like terms: 3x + -1x = 2x -3 + 2x = 7 Solving -3 + 2x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2x = 7 + 3 Combine like terms: -3 + 3 = 0 0 + 2x = 7 + 3 2x = 7 + 3 Combine like terms: 7 + 3 = 10 2x = 10 Divide each side by '2'. x = 5 Simplifying x = 5
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