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0.70+3.80+3x+4x=50
We move all terms to the left:
0.70+3.80+3x+4x-(50)=0
We add all the numbers together, and all the variables
7x-45.5=0
We move all terms containing x to the left, all other terms to the right
7x=45.5
x=45.5/7
x=6+2.3333333333333/4.6666666666667
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