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Simplifying 3x + -7(3 + -1x) = 13 3x + (3 * -7 + -1x * -7) = 13 3x + (-21 + 7x) = 13 Reorder the terms: -21 + 3x + 7x = 13 Combine like terms: 3x + 7x = 10x -21 + 10x = 13 Solving -21 + 10x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10x = 13 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = 13 + 21 10x = 13 + 21 Combine like terms: 13 + 21 = 34 10x = 34 Divide each side by '10'. x = 3.4 Simplifying x = 3.4
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