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a)5(2x-1)+3(x-1)-6(7x-12)=15(8-x)-84
10x-5+3x-3-42x+72=120-15x-84
10x+3x-42x+15x=120-84+5+3-72
-14x=--28 |:(-14)
x=2
b)2(3x+4)-3x=6(2x-3)+2(3-4x)+5(2x-3)
6x+8-3x=12x-18+6-8x+10x-15
6x-3x-12x+8x-10x=-18+6-15-8
-11x=-35 |:(-1)
11x=35
x=35/11
c)
36x-16+4x-14-7x=9x-30+5x-110-4
36x+4x-7x-9x-5x=16+14-110-4-30
19x=-114 => x=-6
d)
10x-8-3x-2+11=15x-30+3x-24x+18
10x-3x-15x-3x+24x=18-30+8-11+2
13x=-13 => x=-1
