oblicz i podaj wynik a)1+5(2z+3)=6 b)4-3(5x-1)=22 c)5x+2(4-z)=z d) 4y-3(3y-5)=2y daje naj. proszę o pomoc ponieważ tego nie rozumiem!!!
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a)
1+5(2z+3)=6
1 + 10z + 15 = 6
10z = -10 /:10
z = -1
b)
4-3(5x-1)=22
4 - 15x + 3 = 22
-15x = 15 /:(-15)
x = -1
c)
5z+2(4-z)=z
5z+8-2z = z
2z = -8 /:2
z = -4
d)
4y-3(3y-5)=2y
4y - 9y + 15 = 2y
-7y = -15 /:(-7)
y = 15/7