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Simplifying -7(3 + -4x) = -105 (3 * -7 + -4x * -7) = -105 (-21 + 28x) = -105 Solving -21 + 28x = -105 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 + 28x = -105 + 21 Combine like terms: -21 + 21 = 0 0 + 28x = -105 + 21 28x = -105 + 21 Combine like terms: -105 + 21 = -84 28x = -84 Divide each side by '28'. x = -3 Simplifying x = -3
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