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21/(4-3x)=63
We move all terms to the left:
21/(4-3x)-(63)=0
Domain of the equation: (4-3x)!=0We add all the numbers together, and all the variables
We move all terms containing x to the left, all other terms to the right
-3x!=-4
x!=-4/-3
x!=1+1/3
x∈R
21/(-3x+4)-63=0
We multiply all the terms by the denominator
-63*(-3x+4)+21=0
We multiply parentheses
189x-252+21=0
We add all the numbers together, and all the variables
189x-231=0
We move all terms containing x to the left, all other terms to the right
189x=231
x=231/189
x=1+2/9
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