<span>6,7х+3х+63,5=500</span>
<span>9,7x = 500-63,5</span>
<span>9,7x = 436,5</span>
<span>x = 45</span>
<span>Ответ: х = 45.</span>
6,7х+3х+63,5=500
9,7x = 500-63,5
9,7x = 436,5
x= 436,5:9,7
x=45
6,7
+3
—-
9,7
500
- 63,5