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8x-7x=-5
x=-5
b)7n +2 = 6n - 3
7n-6n=-3-2
n=-5
c)-x + 25 = 2x - 2
-3x=-27/(-3)
x=-9
d)hmmm tu nie ma =
mysle ze miało być tak :))
d)-9z - 7 = -z - 6
-8z=1/(-8)
z=-1/8
:))
8x+5=7x
8x-7x=-5
x=-5
b)
7n+2=6n-3
7n-6n=-3-2
n=-5
c)
-x+25=2x-2
-x-2x=-2-25
-3x=-27/:(-3)
x=9
d)
-9z-7+(-z)-6
-10z-13
5=7x-8x
5=-1x
-5=x
b)7n +2 = 6n - 3
7n-6n=-3-2
n=-5
c)-x + 25 = 2x - 2
-x-2x=-2-25
-3x=-27
x=9
d)-9z - 7 + -z - 6
-9z-z=13
-10z=13
z=-1,3