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Simplifying 7x + -3(-1x + -13) = 21 Reorder the terms: 7x + -3(-13 + -1x) = 21 7x + (-13 * -3 + -1x * -3) = 21 7x + (39 + 3x) = 21 Reorder the terms: 39 + 7x + 3x = 21 Combine like terms: 7x + 3x = 10x 39 + 10x = 21 Solving 39 + 10x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 10x = 21 + -39 Combine like terms: 39 + -39 = 0 0 + 10x = 21 + -39 10x = 21 + -39 Combine like terms: 21 + -39 = -18 10x = -18 Divide each side by '10'. x = -1.8 Simplifying x = -1.8
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