******************* подарка **************
5 - (1/2)*(x - 6) =4;
5 -4 =(1/2)*(x - 6);
1 = (1/2)*(x-6);
2 = x - 6;
x =2+6;
x = 8 .
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(2/3)*( 3x-6 ) =3 ;
(2/3)*3 *(x - 2) =3;
2(x - 2) = 3 ;
x - 2 =1;5;
x = 2 + 1,5;
x = 3,5.