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Simplifying 3x + -7(-1x + -13) = 21 Reorder the terms: 3x + -7(-13 + -1x) = 21 3x + (-13 * -7 + -1x * -7) = 21 3x + (91 + 7x) = 21 Reorder the terms: 91 + 3x + 7x = 21 Combine like terms: 3x + 7x = 10x 91 + 10x = 21 Solving 91 + 10x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-91' to each side of the equation. 91 + -91 + 10x = 21 + -91 Combine like terms: 91 + -91 = 0 0 + 10x = 21 + -91 10x = 21 + -91 Combine like terms: 21 + -91 = -70 10x = -70 Divide each side by '10'. x = -7 Simplifying x = -7
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