Question

(7x - 2) - (7х + 1,4) = 0.

Answer 1

$\displaystyle (7x-2)-(7x+1,4)=0\\7x-2-7x-1,4=0\\-3,4=0\\\oslash$

Answer 2

7x-2-7x-1,4=0
-3.4=0
X є порожня множина