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2.5-6.4+1.2x=21.35
We move all terms to the left:
2.5-6.4+1.2x-(21.35)=0
We add all the numbers together, and all the variables
1.2x-25.25=0
We move all terms containing x to the left, all other terms to the right
1.2x=25.25
x=25.25/1.2
x=21+0.050000000000001/1.2
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