দেওয়া আছে, 5x7 - 45 = x5 - 27
বা, 5x7 -x5 = 45 - 27
বা, 25x-7x35= 28-1035
বা, 18x35= 1835
বা, 18x = 18
বা, x = 1818 = 1
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