Question

Решить:

 

a)2 (2 - x) + 3(2x + 4) = 7

 

б)10(3y - 2) - 5(4y - 11) = 25 + 3(5y - 2)

Answer 1

a)

4-2x+6x+12=7

-2x+6x=7-4-12

4x=- 9

x=-9:4

x=-2,25

 

b)

 

30y-20-20y+55=25+15y-6

30y-20y-15y=25-6+20-55

-5y=-16

y=-16:(-5)

y=3,2