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2x-3,5 - 5/6x -1/6= 2x+5 /*6
12x-21- 5x -1=12x+30
7x-12x=30+22
-5x=52
-x=10,4
x=-10,4
( x + 1 )² + (x - 2 )²= 2(x-1) (x+1)
x² +1+2x +x²+4-4x=2(x²-1)
2x²-2x+5=2x²-2
2x²- 2x²- 2x=-2-5
-2x=-7
x=3,5