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8.5x+2.2(2x-5)=54
We move all terms to the left:
8.5x+2.2(2x-5)-(54)=0
We multiply parentheses
8.5x+4.4x-11-54=0
We add all the numbers together, and all the variables
12.9x-65=0
We move all terms containing x to the left, all other terms to the right
12.9x=65
x=65/12.9
x=5+0.5/12.9
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