-y=5-3x -> y=3x-5 -> y=3*2-5=1
2x+7*(3x-5)=11 -> 2x+21x-35=11 -> 23x=46 -> x=2
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-y=5-3x -> y=3x-5 -> y=3*2-5=1
2x+7*(3x-5)=11 -> 2x+21x-35=11 -> 23x=46 -> x=2