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4 * (-4) + 9 = -7; so -7 is equivalent to 4 times -4 plus 9.
1+2+3+4+5+6+7+8+9=37
1+2+3+4+5+6+7+8+9= 45 :)
-42 + 37 - (6 x 9) + (7/4) = -57.25
u = 7 + 2 + (4 - 5) = 9 + (-1) = 8