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2a+xb=2\times 4a
Multiply both sides of the equation by 2x, the least common multiple of x,2.
2a+xb=8a
Multiply 2 and 4 to get 8.
2a+xb-8a=0
Subtract 8a from both sides.
-6a+xb=0
Combine 2a and -8a to get -6a.
-6a=-xb
Subtract xb from both sides. Anything subtracted from zero gives its negation.
-6a=-bx
Reorder the terms.
\frac{-6a}{-6}=-\frac{bx}{-6}
Divide both sides by -6.
a=-\frac{bx}{-6}
Dividing by -6 undoes the multiplication by -6.
a=\frac{bx}{6}
Divide -bx by -6.
2a+xb=2\times 4a
Multiply both sides of the equation by 2x, the least common multiple of x,2.
2a+xb=8a
Multiply 2 and 4 to get 8.
xb=8a-2a
Subtract 2a from both sides.
xb=6a
Combine 8a and -2a to get 6a.
\frac{xb}{x}=\frac{6a}{x}
Divide both sides by x.
b=\frac{6a}{x}
Dividing by x undoes the multiplication by x.