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Simplifying -121 = -4x + -3(4x + -13) Reorder the terms: -121 = -4x + -3(-13 + 4x) -121 = -4x + (-13 * -3 + 4x * -3) -121 = -4x + (39 + -12x) Reorder the terms: -121 = 39 + -4x + -12x Combine like terms: -4x + -12x = -16x -121 = 39 + -16x Solving -121 = 39 + -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 = 39 + -16x + 16x Combine like terms: -16x + 16x = 0 -121 + 16x = 39 + 0 -121 + 16x = 39 Add '121' to each side of the equation. -121 + 121 + 16x = 39 + 121 Combine like terms: -121 + 121 = 0 0 + 16x = 39 + 121 16x = 39 + 121 Combine like terms: 39 + 121 = 160 16x = 160 Divide each side by '16'. x = 10 Simplifying x = 10
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