Question

2,3х+31+2.5х=81
а)2.5
б)62.5
в)25
г)0.25
д)6.25

Answer 1

2,3х+31+2.5х=81
4,8x+31=81
4,8x=81-31
4,8x=50
x=50:4,8
x=10 5/12