x+5=7 - 2, x-9=25 - 34, x*10=670 - 67, x:35=315 - 9, 250-x=220 - 30, (x-10)+13=46 - 43, (x-13)-12=154 - 179, x-46=92 - 138, 67-x=45 - 22, 56-34-x=22 - 0,

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