1)х+34=76, х=76-34, х=42, 42+34=76, 76=76 2)238+у=416, у=416-238, у=178, 238+178=416, 416=416 3)а+157=324, а=324-157, а=167, 167+157=324, 324=324 4)356+b=782, b=782-356, b=426, 356+426=782, 782=782 5)х-546=216, х=216+546, х=762, 762-546=216, 216=216 6)206-у=139, у=206-139, у=67, 206-67=139, 139=139 7)895-а=513, а=895-513, а=382, 895-382=513, 513=513 8)t-2092=1067, t=1067+2092, t=3159, 3159-2092=1067, 1067=1067