(7.4x-12.3x)-(1.56-2.3x)=2.6x
7.4x-12.3x-1.56+2.3x=2.6x
7.4x-12.3x+2.3x-2.6x=1.56
-5.2х=1.56
х=1.56/-5.2
х=-0.3
(7.4x-12.3x)-(1.56-2.3x)=2.6x
7.4x-12.3x-1.56+2.3x=2.6x
7.4x-12.3x+2.3x-2.6x=1.56
-5.2х=1.56
х=1.56/-5.2
х=-0.3