Solve for M₂ F_g=(GM_1M_2)/(r^2)

$F_{g} = \frac{G M_{1} M_{2}}{r^{2}}$

Rewrite the equation as $\frac{G M_{1} M_{2}}{r^{2}} = M_{2 g}$ .

$\frac{G M_{1} M_{2}}{r^{2}} = M_{2 g}$

Subtract $\frac{GCF}{r^{2}}$ from both sides of the equation.

$0 = F_{g} - \frac{GCF}{r^{2}}$

Rewrite the equation as $M_{2 g} - \frac{G M_{1} M_{2}}{r^{2}} = 0$ .

$M_{2 g} - \frac{G M_{1} M_{2}}{r^{2}} = 0$