решите уравнения;
1) -5(z-7)=30-(2z+1)
2) -2(x+5)+3=2-3(x+1)
3) (2x-1)+6x=10-7
1) -5(z-7)=30-(2z+1)
2) -2(x+5)+3=2-3(x+1)
3) (2x-1)+6x=10-7
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Answers & Comments
-5z+35=30-2z-1
-5z+2z=30-35-1
-3z=-6
z=2
2) -2(x+5)+3=2-3(x+1)
-2x-10+3=2-3x-3
-2x+3x=7+2-3
x=6
3) (2x-1)+6x=10-7
2x-1+6x=3
8x=4
x=0,5