Question

3rd question i will mark this answer

Answer 1

Addition axiom!!
3 is added to both sides...
Thats it!!!
Hope it helps

Answer 2

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⚠️SOLUTION ⚠️⤵️

⏩ GIVEN : 4P = 5Q .

▶️ 4P + 3 = 5Q + 3

▶️ 5Q + 3 = 5Q + 3

▶️ 5Q - 5Q = 3 - 3

$\cancel{5Q }\: \cancel{- 5Q} = \cancel{3 \: } - \cancel{3 \: }$

▶️ = 0