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-x = 9-7
-x = 2 |:(-1)
x = -2
Spr:7-(-2) = 7+2 = 9
b) 36 + x = (-1)
x = -1-36
x = -37
Spr:36+(-37) = -1
c) x + 12,5 = 3,5
x = 3,5-12,5
x = -9
Spr:-9+12,5 = 3,5
d) x - 8,25 = - 5,25
x = -5,25+8,25
x = 3
Spr:3-8,25 = - 5,25
Sry ale moge ci dać tylko to bo musze kończyć już