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Simplifying 7(-9 + -1x) = -91 (-9 * 7 + -1x * 7) = -91 (-63 + -7x) = -91 Solving -63 + -7x = -91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + -7x = -91 + 63 Combine like terms: -63 + 63 = 0 0 + -7x = -91 + 63 -7x = -91 + 63 Combine like terms: -91 + 63 = -28 -7x = -28 Divide each side by '-7'. x = 4 Simplifying x = 4
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