1) - 2х+12х=5+3+4+8;10х=20;х=22)-х-2х-8х=13-18-6;-11х=-11;х=1
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1) - 2х+12х=5+3+4+8;10х=20;х=2
2)-х-2х-8х=13-18-6;-11х=-11;х=1