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6x+30x=15+21
We move all terms to the left:
6x+30x-(15+21)=0
We add all the numbers together, and all the variables
6x+30x-36=0
We add all the numbers together, and all the variables
36x-36=0
We move all terms containing x to the left, all other terms to the right
36x=36
x=36/36
x=1
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