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Simplifying 7x + 7(x + -13) = -21 Reorder the terms: 7x + 7(-13 + x) = -21 7x + (-13 * 7 + x * 7) = -21 7x + (-91 + 7x) = -21 Reorder the terms: -91 + 7x + 7x = -21 Combine like terms: 7x + 7x = 14x -91 + 14x = -21 Solving -91 + 14x = -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 + 14x = -21 + 91 Combine like terms: -91 + 91 = 0 0 + 14x = -21 + 91 14x = -21 + 91 Combine like terms: -21 + 91 = 70 14x = 70 Divide each side by '14'. x = 5 Simplifying x = 5
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