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29+0.2x=66.4
We move all terms to the left:
29+0.2x-(66.4)=0
We add all the numbers together, and all the variables
0.2x-37.4=0
We move all terms containing x to the left, all other terms to the right
0.2x=37.4
x=37.4/0.2
x=186+0.2/0.2
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