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Simplifying 81 + -4(2)(-5) = x Multiply -4 * 2 81 + -8 * -5 = x Multiply -8 * -5 81 + 40 = x Combine like terms: 81 + 40 = 121 121 = x Solving 121 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 121 + -1x = x + -1x Combine like terms: x + -1x = 0 121 + -1x = 0 Add '-121' to each side of the equation. 121 + -121 + -1x = 0 + -121 Combine like terms: 121 + -121 = 0 0 + -1x = 0 + -121 -1x = 0 + -121 Combine like terms: 0 + -121 = -121 -1x = -121 Divide each side by '-1'. x = 121 Simplifying x = 121
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