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3x+12 |:3
x=4 odp.tak :)
2.7x-5=-26
7x=-26+5
7x=-21 |:7
x= -3 odp.tak
3.3(x+2)=21
3x+6=21
3x=21-6
3x=15 | :3
x=5 odp.niee
4.4x-4=0
4x=0+4
4x=4 |:4
x=1 odp.taaak