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4+3x-12=6-2x+6
5x=20 /5
x=4
4)
x²-6x+9+x²+2x-2x-4=2x²+x-14x-7-2
-6x-x-14x=-9-5
7x=-14 /7
x=-2
6)
2x-x+3 \2 =7
x+3\2 =7
x+3=14
x=11
8)
0,03-0,02-0,2x<0,01
0,01-0,2x<0,01
-0,2x<0 /(-0,2)
x>0 |-----------------------
(0;+∞) --------------|--------------------> x
0