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x=30
2,2x-9x=6
-7x=6 /(-7)
x=-0,86
3.-2x+2+8+4x=3-5x
-2x+4x+5x=3-2-8
7x=-7 /7
x=-1
4.-12x+4x=2x+2-5
-12x+4x-2x=2-5
-10x=-3 /(-10)
x=0,3
5.3-3x-5=8-2x+2
-3x+2x=-3+5+8+2
-1x=12 /(-1)
x=-12
7.4x-3x=5+1
1x=6 /1
x=6
8,-x+3=2x+2+1
-x-2x=-3+2+1
-3x=0 /(-3)
x=0
10.1,4x+15=29
1,4x=29-15
1,4x=14 /(1,4)
x=10
11.1-0,7x=-0,07x-3,5
-0,7x+0,07x=-1-3,5
-0,63x=-4,5
13.x-0,33-x-1=x
-x=0,33+1
-x=1,33 /(-1)
x=-1,33
14.x-0,5-x+1,25=2x+2
-2x=0,5-1,25+2
-2x=1.25 /(-2)
x=-0,625
15.3x-18=21x+0,75
3x-21x=18+0,75
-18x=18,75 /(-18)
x=-1,04