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2014-11-15T20:57:27+02:00
89-5x+14
103-5x=
-5x=-103    (-1)
x=103/5
x=20,6

5(2x-3)-6x+x+30
10x-15--5x+30=
5x+15=
5x=-15
x=-15/5
x=-3

3(2x+10)-20+4(x+20)
6x+30-20+4x+80=
10x+90
10x=-90
x=-90/10
x=-9
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