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1/2y + 3 = 7
1/2y=7-3
1/2y=4
y=4:1/2
y=4*2
y=8
b)
3/5y + 2/5 = 4
3/5y=4-2/5
3/5y=20/5-2/5
3/5y=18/5
y=18/5:3/5
y=18/5*5/3
y=6
c)
3(y+2) = 5
3y+6=5
3y=5-6
3y=-1
y=-1/3
d)
7(y+3) = 5y + 2 + 2y
7y+21-5y-2y=2
0=2-21
0=-19 sprzeczne
e)
y/2 + 1/3 = 7/6 obie strony mnożymy przez 6
3y+2=7
3y=7-2
3y=5
y=5/3=1 i 2/3
pozdrawiam:)