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Simplifying 78 + 7x = 81 + 4x Solving 78 + 7x = 81 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 78 + 7x + -4x = 81 + 4x + -4x Combine like terms: 7x + -4x = 3x 78 + 3x = 81 + 4x + -4x Combine like terms: 4x + -4x = 0 78 + 3x = 81 + 0 78 + 3x = 81 Add '-78' to each side of the equation. 78 + -78 + 3x = 81 + -78 Combine like terms: 78 + -78 = 0 0 + 3x = 81 + -78 3x = 81 + -78 Combine like terms: 81 + -78 = 3 3x = 3 Divide each side by '3'. x = 1 Simplifying x = 1
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