Question
Fill in the blank.3x - 5 = 7 - x ⇒ x = _____.

Answer

3x - 5 = 7 - x ⇒ x = 3.Solution:
3x - 5 = 7 - x
⇒ 3x + x = 7 + 5 [Transposing x to the L.H.S. and 5 to the R.H.S]
⇒ 4x = 12
$\Rightarrow\frac{\text{4x}}{4}=\frac{12}{4}$
x = 3

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