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x+12*6:2=42
x+72:2=42
x+36=42
x=42-36
x=6
2.
2+x+x+(2x-4)*4:2
2+2x+(8x-16):2
2+2x+4x-8
6x-6
3.
1/3x-2=x+2
-2-2=x-1/3x
2/3x=-4 |:2/3
x=-6
1-6/7x=4/7
-6/7x=4/7-1
-6/7x=-3/7 |:-6/7
x=0,5
6(1/4x-2)=18
1,5x-12=18
1,5x=30 |:1,5
x=20