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0.3*0.88+0.7x=0.4
We move all terms to the left:
0.3*0.88+0.7x-(0.4)=0
We add all the numbers together, and all the variables
0.7x-0.136=0
We move all terms containing x to the left, all other terms to the right
0.7x=0.136
x=0.136/0.7
x=0.136/0.7
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