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75+3.50x=30
We move all terms to the left:
75+3.50x-(30)=0
We add all the numbers together, and all the variables
3.50x+45=0
We move all terms containing x to the left, all other terms to the right
3.50x=-45
x=-45/3.50
x=-12+1/1.1666666666667
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