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Simplifying 81x + -4x = 7x + 15 Combine like terms: 81x + -4x = 77x 77x = 7x + 15 Reorder the terms: 77x = 15 + 7x Solving 77x = 15 + 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. 77x + -7x = 15 + 7x + -7x Combine like terms: 77x + -7x = 70x 70x = 15 + 7x + -7x Combine like terms: 7x + -7x = 0 70x = 15 + 0 70x = 15 Divide each side by '70'. x = 0.2142857143 Simplifying x = 0.2142857143
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