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6x-3-5x+15+18x-24=83
6x-5x+18x=83+3-15+24
19x=95
x=5
b) 0.2x+0.5x+5(5x-1)-27x=6.5
0,2x+0,5x+25x-5-27x=6,5
0,2x+0,5x+25x-27x=6,5+5
-1,3=11,5
x=-8,85 (w przybliżeniu)
c) 0.3(0.4x-1.2)+0.36x=0.6
0,12x-0,36+0,36x=0,6
0,12x+0,36x=0,6+0,36
0,48x=0,96
x=2