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20x -2 - 10x-10=7x
10x-12=7x
10x-7x=12
3x=12
x=4
b) 2x-3x+5/4=-1/4x-1 /x4
8x-12x + 5=-1-1
-4x+5=-2
-4x=-2-5
-4x=-7
x=7/4
2(2x-1)-5(x-2)=(0,7x)*10
4x-2-5x+10=7x
4x-5x-7x=-10+2
-8x=-8
x=1
2x-3x+5/4= -1/4x -1 /*4
8x-3x-5=1x-1
8x-3x-x=-1+5
4x=4
x=1