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Simplifying 121 = -7x + 3(-3x + 3) Reorder the terms: 121 = -7x + 3(3 + -3x) 121 = -7x + (3 * 3 + -3x * 3) 121 = -7x + (9 + -9x) Reorder the terms: 121 = 9 + -7x + -9x Combine like terms: -7x + -9x = -16x 121 = 9 + -16x Solving 121 = 9 + -16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16x' to each side of the equation. 121 + 16x = 9 + -16x + 16x Combine like terms: -16x + 16x = 0 121 + 16x = 9 + 0 121 + 16x = 9 Add '-121' to each side of the equation. 121 + -121 + 16x = 9 + -121 Combine like terms: 121 + -121 = 0 0 + 16x = 9 + -121 16x = 9 + -121 Combine like terms: 9 + -121 = -112 16x = -112 Divide each side by '16'. x = -7 Simplifying x = -7
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