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7a=24-3b
Subtract 3b from both sides.
\frac{7a}{7}=\frac{24-3b}{7}
Divide both sides by 7.
a=\frac{24-3b}{7}
Dividing by 7 undoes the multiplication by 7.
3b=24-7a
Subtract 7a from both sides.
\frac{3b}{3}=\frac{24-7a}{3}
Divide both sides by 3.
b=\frac{24-7a}{3}
Dividing by 3 undoes the multiplication by 3.
b=-\frac{7a}{3}+8
Divide 24-7a by 3.