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8(x+1) + 2 (x-1) = 7x
8x+8+2x-2 = 7x
3x = -6
x = -2
sprawdzam
2(-2+1) + 1/2 (-2-1) = 7/4 *-2
-2 + (-1,5) = -14/4
-3,5 = -3,5