Question
Solve these equation and check the solution.
3u – 7 = 2u + 3
3u – 7 = 2u + 3
✓
Answer
3u – 7 = 2u + 3
Bring the unknown terms to one side
By subtracting 2u from both sides
⇒ 3u – 7 – 2u = 2u + 3 – 2u
⇒ u – 7 = 3
Add 7 to both sides
⇒ u – 7 + 7 = 3 + 7
⇒ u = 10
Check: For u = 10
LHS = 3u – 7
= 3 × 10 – 7
= 30 – 7
= 23
RHS = 2u + 3
= 2 × 10 + 3
= 20 + 3
= 23
LHS = RHS
Hence checked.
Bring the unknown terms to one side
By subtracting 2u from both sides
⇒ 3u – 7 – 2u = 2u + 3 – 2u
⇒ u – 7 = 3
Add 7 to both sides
⇒ u – 7 + 7 = 3 + 7
⇒ u = 10
Check: For u = 10
LHS = 3u – 7
= 3 × 10 – 7
= 30 – 7
= 23
RHS = 2u + 3
= 2 × 10 + 3
= 20 + 3
= 23
LHS = RHS
Hence checked.
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