Question

dau coroana !!aflati X din egalitatea :
a) (3X-1)x20=280

Answer 1

(3x-1)*20=280
3x-1=280÷20=14
3*x=14+1=15
x=15÷3
x=5

Answer 2

$(3x-1)*20=280 \\ 3x-1=280:20 \\ 3x=14+1 \\ x=15:3 \\ x=5$