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0.4*0.375x-1.6875=3.25
We move all terms to the left:
0.4*0.375x-1.6875-(3.25)=0
We add all the numbers together, and all the variables
0.4*0.375x-4.9375=0
We move all terms containing x to the left, all other terms to the right
0.4*0.375x=4.9375
x=4.9375/1
x=4.9375
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