Solve for a
a=\frac{-5b-c-74}{7}
Solve for b
b=\frac{-7a-c-74}{5}
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7a+c=-74-5b
Subtract 5b from both sides.
7a=-74-5b-c
Subtract c from both sides.
7a=-5b-c-74
The equation is in standard form.
\frac{7a}{7}=\frac{-5b-c-74}{7}
Divide both sides by 7.
a=\frac{-5b-c-74}{7}
Dividing by 7 undoes the multiplication by 7.
5b+c=-74-7a
Subtract 7a from both sides.
5b=-74-7a-c
Subtract c from both sides.
5b=-7a-c-74
The equation is in standard form.
\frac{5b}{5}=\frac{-7a-c-74}{5}
Divide both sides by 5.
b=\frac{-7a-c-74}{5}
Dividing by 5 undoes the multiplication by 5.
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