Verified answer

6,7x+3x+63,5=500

9.7x+63.5=500

9.7x=500-63.5

9.7x=436.5

x=436.5/9.7

x=45

ответ: 45

6,7x+3x+63,5=500

6,7х+3х=500-63,5

9,7х=436,5

х=436,5:9,7

х=45