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49=15x+6x-14
We move all terms to the left:
49-(15x+6x-14)=0
We add all the numbers together, and all the variables
-(21x-14)+49=0
We get rid of parentheses
-21x+14+49=0
We add all the numbers together, and all the variables
-21x+63=0
We move all terms containing x to the left, all other terms to the right
-21x=-63
x=-63/-21
x=+3
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