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x+2=7x-7
x-7x=-7-2
-6x=-9
x=1,5
2x+4/12 = x-2/3
6x+12=12x-24
6x-12x=-24-12
-6x=-36
x=6
x+5/12 = x-1/3
3x+15=12x-12
3x-12x=-12-15
-9x=-27
x=3