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-2x-5x=25-4
-7x=21 / :(-7)
x= -3
b) 7y-8=-y+24
8y=32 / :8
y=4
c) -8z+5 = -z-1
-7z = -6 / :(-7)
z = (dodatnia liczba nieskończona. musiałaś coś źle przepisać)
d) -2m+7=m-6
-3m=-13 / (-3)
m= 4,(3)
e) 6-5x = 2x-7
-7x=-13 / : (-7)
x= (też dodatnia, nieskończona)
f) -5t + 1 = 8-6t
t=7