42x-378=840

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Solution for 42x-378=840 equation: 



42x-378=840

We move all terms to the left:

42x-378-(840)=0

We add all the numbers together, and all the variables

42x-1218=0

We move all terms containing x to the left, all other terms to the right

42x=1218

x=1218/42

x=29

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