240+х=735* 6 4020:х=2563-2553

240+х = 735 *6 240+х=4410 х=4410-240 х=4170 ---- проверка 240+4170=735*6 4410=4410 4020/х=2563-2553 4020/х=10 х=4020/10 х=402 ---- проверка 4020/402=2563-2553 10=10

240+х=4350 х=4350-240 х=4110 4020:х=10 х=4020:10 х=402