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\frac{3}{2}a+\frac{1}{2}b=x
Divide each term of 3a+b by 2 to get \frac{3}{2}a+\frac{1}{2}b.
\frac{3}{2}a=x-\frac{1}{2}b
Subtract \frac{1}{2}b from both sides.
\frac{3}{2}a=-\frac{b}{2}+x
The equation is in standard form.
\frac{\frac{3}{2}a}{\frac{3}{2}}=\frac{-\frac{b}{2}+x}{\frac{3}{2}}
Divide both sides of the equation by \frac{3}{2}, which is the same as multiplying both sides by the reciprocal of the fraction.
a=\frac{-\frac{b}{2}+x}{\frac{3}{2}}
Dividing by \frac{3}{2} undoes the multiplication by \frac{3}{2}.
a=\frac{2x-b}{3}
Divide x-\frac{b}{2} by \frac{3}{2} by multiplying x-\frac{b}{2} by the reciprocal of \frac{3}{2}.
\frac{3}{2}a+\frac{1}{2}b=x
Divide each term of 3a+b by 2 to get \frac{3}{2}a+\frac{1}{2}b.
\frac{1}{2}b=x-\frac{3}{2}a
Subtract \frac{3}{2}a from both sides.
\frac{1}{2}b=-\frac{3a}{2}+x
The equation is in standard form.
\frac{\frac{1}{2}b}{\frac{1}{2}}=\frac{-\frac{3a}{2}+x}{\frac{1}{2}}
Multiply both sides by 2.
b=\frac{-\frac{3a}{2}+x}{\frac{1}{2}}
Dividing by \frac{1}{2} undoes the multiplication by \frac{1}{2}.
b=2x-3a
Divide x-\frac{3a}{2} by \frac{1}{2} by multiplying x-\frac{3a}{2} by the reciprocal of \frac{1}{2}.