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2.5x-6.4+1.2x=21.35
We move all terms to the left:
2.5x-6.4+1.2x-(21.35)=0
We add all the numbers together, and all the variables
3.7x-27.75=0
We move all terms containing x to the left, all other terms to the right
3.7x=27.75
x=27.75/3.7
x=7+1/2
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