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51=3*4x
We move all terms to the left:
51-(3*4x)=0
We add all the numbers together, and all the variables
-(+3*4x)+51=0
We get rid of parentheses
-3*4x+51=0
Wy multiply elements
-12x+51=0
We move all terms containing x to the left, all other terms to the right
-12x=-51
x=-51/-12
x=4+1/4
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