Колягин 10 класс, алгебра.
Решите уравнение, если не сложно:
0,2x-7=-0,3*(х+4)
x(x+2)=x^2+5*(x-6)
4x-2(x-1,5)=3,5-3(1/2-x)
3x-2x(x-1)=2(7-x^2)
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