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0.4x+5.1=2.5
We move all terms to the left:
0.4x+5.1-(2.5)=0
We add all the numbers together, and all the variables
0.4x+2.6=0
We move all terms containing x to the left, all other terms to the right
0.4x=-2.6
x=-2.6/0.4
x=-6+0.2/0.4
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