5x=150
x=30
7a=1,4
a=0,2
-4z=4
z=-1
-3y=1
y=-1/3
-5m=0M=0
10x=-5x=-0,5
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2)7а=1,4. а=1,4:7=0,2
3)-4z=4. z=-4:4=-1
4)-3y=1. y=-1/3
5)m=0
5x=150
x=30
7a=1,4
a=0,2
-4z=4
z=-1
-3y=1
y=-1/3
-5m=0
M=0
10x=-5
x=-0,5