Question

1) 9b + 6b - 15 = 615
2) 2a + 123a + 97 =472
3) 17x - x +5x - 19 = 170
4)73y - y - 22y + 40 = 190
Решите уравнение!Прошу!

Answer 1

9b+6b-15=615
15b=630
b=630:15b=42
2a+123a+97=472
125а+97=472
125а=572-97
125а=475
а=475:125
а=3
73y-y-22y+40=19050
y=190-4050
y=150
y=150/50
y=3
17x-x+5x-19=170
21x=189
x=9