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Step-1

Title: Solve the equation

Grade: 7-b Lesson: S2-L3

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Steps	Problem	Solution
1	Solve	\$ 2r + 12 = 72 \$
2	Adding '\$-12\$' on both sides	\$ 2r + \cancel12 - \cancel12 = 72 - 12 \$
3	After cancelation	\$ 2r = 60 \$
4	Dividing on both sides by '\$2\$' of the equality	\$ \cancel(2)^1/ \cancel(2)^1 r = \cancel(60)^30/ \cancel(2)^1 \$
5	After cancelation	\$ r = 30 \$
6	Answer	A = \$ r = 30 \$

Steps

Problem

Solution

Solve

\$ 2r + 12 = 72 \$

Adding '\$-12\$' on both sides

\$ 2r + \cancel12 - \cancel12 = 72 - 12 \$

After cancelation

\$ 2r = 60 \$

Dividing on both sides by '\$2\$' of the equality

\$ \cancel(2)^1/ \cancel(2)^1 r = \cancel(60)^30/ \cancel(2)^1 \$

After cancelation

\$ r = 30 \$

Answer

A = \$ r = 30 \$