Question

3(с-4)-4(с 5)=с-30 решите

Answer 1

3(c-4)-4(c5)=c-30
3c-12-20c=c-30
30-12=c-3c+20c
18=18c
c=1

Answer 2

3c-12-20c=c-30
30-12=c-3c+20c
18=18c
c=1