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14=2(-1)5-3a(-1)4+(a-1)(-1)+2a+5
14=(-10)+12a-a+1+10a
14=(-9)+21a
14+9=21a
a=23\21
b)
5=(-7)*2*4+(8a-1)4+3
5=-56+32a-4+3
5=-57+32a
5+57=32a
62=32a
a=62\32
c)nie rozómię o co CI chodzi