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y+4=0 |/-4
y=-4
b)28z+21-30z+42=0
-2z+63=0 |-63
-2z=-63 |/-2
z=31,5
Dalej mi się nie chce!
b-z=10.5
c-x=60
d-y=4.14
16y-8+12-15y=0
16y-15y=8-12
y=-4
7( 4z + 3- 6(5z +7)= 0
7(4z+3-30z+42)=0
28z+21-210+294=0
28z=210-294-21
28z=-105
z=-105/28
z=-3,75
c)0,2(1-0,3x)= 0,04x+1
0,2-0,06x=0,04x+1
-0,06x-0,04x=1-0,2
-0,1x=0,8
x=-8
d)2y+5,6= 3,4y+0,2
2y-3,4y=0,2-5,6
-1,4y=-5,4
y=3,85