16:(9-Х)+8=10;  (4хХ-130):7=50

16/(9-х)=2; 16=2(9-х); 8=9-х; х=1; (4х-130)/7=50; 4х-130=350; 4х=480; х=120

16 :( 9 - х ) + 8 = 10 16 :(9 - х ) =10 - 8  16 :(9 -х) = 2  9 -х =16 :2 9 -х =8 х =9 -8  х =1 проверка : 16 : ( 9 - 1 )+8 = 10                   10=10   (4 *х - 130) : 7 = 50 4х -130 =50 * 7  4х - 130 = 350 4х =350 +130 4х =480 х =480 : 4  х =120 проверка : (4 *120 - 130) : 7 =50                       50=50 *************************************************************************************************************