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2x+6-3x-3=x-13
-x-x=-13-3
-2x=-16
x=8
b) 1+2 [3 (x-1) -5 (2x-3)] = 2x -7
1+2(3x-3-10x+15)=2x-7
1-14x+24=2x-7
-14x-2x=-7-25
-16x=-32
x=2
c) 5 (x-1) -2 (x+3) = 3x +2
5x-5-2x-6=3x+2
3x-3x=2+11
0=13 sprzeczne
d) 3 (2x-3) +2 (x-4) = 4 (x-2) -3 (5-x)
6x-9+2x-8=4x-8-15+3x
8x-7x=-23+17
x=-6
e) 4 (x-2) -5 (3x-9) = 0
4x-8-15x+45=0
-11x=-37
x=37/11
f) 2 (3-x) +5 =3-2 (x-4)
6-2x+5=3-2x+8
-2x+2x=11-11
0=0
rownanie tozsamosciowe