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Simplifying -91 + -9x = 7x + 21 Reorder the terms: -91 + -9x = 21 + 7x Solving -91 + -9x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -91 + -9x + -7x = 21 + 7x + -7x Combine like terms: -9x + -7x = -16x -91 + -16x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -91 + -16x = 21 + 0 -91 + -16x = 21 Add '91' to each side of the equation. -91 + 91 + -16x = 21 + 91 Combine like terms: -91 + 91 = 0 0 + -16x = 21 + 91 -16x = 21 + 91 Combine like terms: 21 + 91 = 112 -16x = 112 Divide each side by '-16'. x = -7 Simplifying x = -7
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