(15b+b):4=3
16b : 4 = 3
4b = 3
b = 3 : 4
b = 0,75
(15*0,75 + 0,75) : 4 = 3
(16*0,75) : 4 = 3
12 : 4 = 3
3 = 3
22x+x-10=59
23x - 10 = 59
23x = 59 + 10
23x = 69
x = 69 : 23
x = 3
