47
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Adding a negative number is the same as subtracting a number. Therefore, 55 + (-8) = 55 - 8 = 47
20+35+40+55+60+55+80=345
55 = 6x + 7 so 48 = 6x so 8 = x
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
8x+7=55 8x=55-7 8x=48 x=48/8 x=6
180