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294x-30=4x-78
We move all terms to the left:
294x-30-(4x-78)=0
We get rid of parentheses
294x-4x+78-30=0
We add all the numbers together, and all the variables
290x+48=0
We move all terms containing x to the left, all other terms to the right
290x=-48
x=-48/290
x=-24/145
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