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Simplifying 7(-3 + -1x) = 7 (-3 * 7 + -1x * 7) = 7 (-21 + -7x) = 7 Solving -21 + -7x = 7 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 + -7x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + -7x = 7 + 21 -7x = 7 + 21 Combine like terms: 7 + 21 = 28 -7x = 28 Divide each side by '-7'. x = -4 Simplifying x = -4
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