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40+1x=4x+19
We move all terms to the left:
40+1x-(4x+19)=0
We add all the numbers together, and all the variables
x-(4x+19)+40=0
We get rid of parentheses
x-4x-19+40=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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