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a)
6x-9-5=6x-4-5
6x-14=6x-9
b)
6x-9-5=4x-6+5
c)
6x-9-5=5-6x+9
d)
6x-9-5=-5+6x-9
6x-14=6x-14
ODP D
2.
a)
4x-10=-25+10x
6x=15 /:3
2x=5
ODP A