7x12 = 84
6x14 = 84
72:4 = 18
84+84 = 168
168 - 18 = 150
<em>8/9 : 8/27 = 8/9 * 27/8 =3</em>
<em> 2/25 : 3/20 = 2/25*20/3=8/15</em>
<em> 21/32 : 35/64 =21/32*64/35=6/5=1 1/5</em>
<em> </em><span><em /><em>5/32 : 30 = </em></span><em>5/32*1/30=1/192</em>
0.7x+x=x(0,7+1)
2,5m-m=m(2,5-1)
-2a-0,6a=-2a(1+0,3)