0.7 + 0.3х+ 0.6 = 0.4х - 1.2
0.3х-0.4х= -1.2-0.7-0.6
-0.1х = -2.5
х= -2.5/-0.1
х= 25
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0.7 + 0.3х+ 0.6 = 0.4х - 1.2
0.3х-0.4х= -1.2-0.7-0.6
-0.1х = -2.5
х= -2.5/-0.1
х= 25