Во втором х=6.Т.к.
5*6+30-8=32
6-6=0
32*0=0
(23,5 + 26,7 + 80,9) : 3 = 131,1 : 3 = 43,7
6 3/4-2 5/6-1 3/8 = 27/4 - 17/6 - 11/8 = (162-68-33) это общий числитель, знаменатель 24, = 61/24 = 2 13/24;
9 8/15 - 4 1/12 + 3 7/20 = 143/15 - 49/12 + 67/20 = 532 - 245 +201 / 60 = 488/60 = 122/15 = 8 2/15;
<span>7 5/8 + 3 2/3 - 8 3/16</span> =61/8+11/3-131/16 = 366+176-393 / 48 = 149/48 = 3 5/48
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1.4x+14=0.6x+0.4
1.4x-0.6x=0.4-14
0.8x=-13.6
x =-17