Answer
$x=50$
Work Step by Step
Add 15x to both sides:
$60x-900+15x=-15x+2850+15x
\\75x-900=2850$
Add 900 to both sides:
$75x-900+900=2850+900
\\75x=3750$
.
Divide both sides by 75:
$\frac{75x}{75}=\frac{3750}{75}
\\x=50$.
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