Задание 3: Реши уравнения.

Решение уравнения x - 70 = 60 * 9:
\(\begin{aligned}\)
x - 70 &= 60 \(\cdot\) 9 \\
x - 70 &= 540 \\
x &= 540 + 70 \\
x &= 610
\(\end{aligned}\)
Проверка:
\(\begin{aligned}\)
610 - 70 &= 540\\
540&= 540
\(\end{aligned}\)

Решение уравнения y : 7 = 7 * 20:
\(\begin{aligned}\)
y : 7 &= 7 \(\cdot\) 20 \\
y : 7 &= 140 \\
y &= 140 \(\cdot\) 7 \\
y &= 980
\(\end{aligned}\)
Проверка:
\(\begin{aligned}\)
980 : 7 &= 140\\
140&= 140
\(\end{aligned}\)