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x+21-3x=5x+56
We move all terms to the left:
x+21-3x-(5x+56)=0
We add all the numbers together, and all the variables
-2x-(5x+56)+21=0
We get rid of parentheses
-2x-5x-56+21=0
We add all the numbers together, and all the variables
-7x-35=0
We move all terms containing x to the left, all other terms to the right
-7x=35
x=35/-7
x=-5
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