6*a+2b+3b-2a=
6a-2a+2b+3b=
4a+5b
9ab
Скорость-V
Путь-S
Время-t
V=S:t
S =V*t
t=S:V
*=умножить
<span>2*(x-3) = (4-x)+5
</span><span>2*x-2*3 = (4-x)+5
</span><span>2*x-2*3 = 4-x+5
</span><span>-6 + 2*x = 9 - x
</span><span>2*x = 15 - x
</span><span>3*x = 15
</span><span>Получим ответ: x = 5</span>