$$\frac { 9 x } { 2 } + 10 = \frac { 7 x + 40 } { 2 }$$
$x=10$
$$9x+20=7x+40$$
$$9x+20-7x=40$$
$$2x+20=40$$
$$2x=40-20$$
$$2x=20$$
$$x=\frac{20}{2}$$
$$x=10$$
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