1.7×5=35
2.35-8=27
3.5-0=5
4.30×4=120
5.120÷20=6
6.27÷9=3
7.5÷5=1
8.1×2=2
9.6+3=9
10.9-2=7
<span>3 (X - 7) - 6x = -x
3x-21-6x=-x
-3x-21=-x
-3x+x=21
-2x=21
x = - (21)/2 = - 10 (1)/2= -10.5
Ответ : x = - 10.5</span>
1) 258+246=504
2) 86*504=43344
3) 43344:129=336
4) 5210-336=4874
Удачи!:)