х = 3,6.
Пошаговое объяснение:
x-(2x+(3x-(4x+(5x-7 = 11
x-(2x+(3x-(4x+5x-7))) = 11
x-(2x+(3x-4x-5x+7)) = 11
x-(2x+3x-4x-5x+7) = 11
x-2x-3x+4x+5x-7 = 11
10х-5х = 11+7
5х = 18
х = 18/5 = 36/10 = 3,6
