3(2х-1)+7(7х-5)=16+3(1-2х);
6х-3+49х-35=16+3-6х
6х+49х+6х=16+3+3+35
61х=57
х=61:57
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6х-3+49х-35=16+3-6х
6х+49х+6х=16+3+3+35
61х=57
х=61:57