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Start with $x = 5$ . Multiply both sides by 3 and then add 2 to both sides. Which equation do you get?

Class 7Checking Solutions by TrialSimple Equations

A $3 x + 2 = 15$
B $3 (x + 2) = 17$
C $x + 3 + 2 = 17$
D $3 x + 2 = 17$

Step-by-Step Solution

x = 5

→

3 x = 15

→

3 x + 2 = 17

. Both sides are changed in the same way, so

x = 5

is still the solution.

Answer: D)

3 x + 2 = 17

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