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780=4x+6x
We move all terms to the left:
780-(4x+6x)=0
We add all the numbers together, and all the variables
-(+10x)+780=0
We get rid of parentheses
-10x+780=0
We move all terms containing x to the left, all other terms to the right
-10x=-780
x=-780/-10
x=+78
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