1)
(x-54)/25 = 76
x/25-54/25 = 76
x25=195425
x = 1954/25 / (1/25)
ответ: x = 1954
2)
(2*x+46)/100 = 1
2*x/100+46/100 = 1
x50=2750
x = 27/50 / (1/50)
ответ: x = 27
3)
(1/5*x+90)*(1/10) = 10
1/5*x+901/10 = 10
x50=1
x = 1 / (1/50)
ответ: x = 50