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x+21=2,4x
Multiply both sides of the equation by 6.
x+21-2,4x=0
Subtract 2,4x from both sides.
-1,4x+21=0
Combine x and -2,4x to get -1,4x.
-1,4x=-21
Subtract 21 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-21}{-1,4}
Divide both sides by -1,4.
x=\frac{-210}{-14}
Expand \frac{-21}{-1,4} by multiplying both numerator and the denominator by 10.
x=15
Divide -210 by -14 to get 15.