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Simplifying -81 = 7(x + -3) + -4 Reorder the terms: -81 = 7(-3 + x) + -4 -81 = (-3 * 7 + x * 7) + -4 -81 = (-21 + 7x) + -4 Reorder the terms: -81 = -21 + -4 + 7x Combine like terms: -21 + -4 = -25 -81 = -25 + 7x Solving -81 = -25 + 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. -81 + -7x = -25 + 7x + -7x Combine like terms: 7x + -7x = 0 -81 + -7x = -25 + 0 -81 + -7x = -25 Add '81' to each side of the equation. -81 + 81 + -7x = -25 + 81 Combine like terms: -81 + 81 = 0 0 + -7x = -25 + 81 -7x = -25 + 81 Combine like terms: -25 + 81 = 56 -7x = 56 Divide each side by '-7'. x = -8 Simplifying x = -8
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