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8.7x+3.2x-6.3=80.57
We move all terms to the left:
8.7x+3.2x-6.3-(80.57)=0
We add all the numbers together, and all the variables
11.9x-86.87=0
We move all terms containing x to the left, all other terms to the right
11.9x=86.87
x=86.87/11.9
x=7+2.2738853503185/7.5796178343949
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