684.
-6+6х+4х=-4
10х=-4+6
10х=2
х=0,2
685.
-24-8х+х=4
-7х=28
х=-4
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684.
-6+6х+4х=-4
10х=-4+6
10х=2
х=0,2
685.
-24-8х+х=4
-7х=28
х=-4