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7*8+(1/5)*20+211 = 7*8+4+211 = 56+4+211 = 271
25
-4/25 + 19/25 = 15/25 = 3/5
25 + x
x2+4x+4 = 25 x2+4x+4-25 = 0 x2+4x-21 = 0 (x+7)(x-3) = 0 x = -7 or x = 3