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4x+0.12=3.36
We move all terms to the left:
4x+0.12-(3.36)=0
We add all the numbers together, and all the variables
4x-3.24=0
We move all terms containing x to the left, all other terms to the right
4x=3.24
x=3.24/4
x=2.6129032258065/3.2258064516129
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