Improved Answer:-
If: 20x+27 = 143
Then: x = 5.8
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15 + 80/90 = 143/9 = 15.888
It's difficult to tell what you're asking. It looks to me like: -17x = -204 ---> x = (-204)/(-17) = 12 21 = -7n ---> n = 21/(-7) = -3 -143 = -11x ---> x = (-143)/(-11) = 13 -16 + x = -15 --> x = -15 + 16 = 1 n-8 = -10 --> n = -10 + 8 = -2 Is this what you mean? Remember that when you multiply (or divide) two Negatives, you get a Positive. A Negative * Positive = Negative; Negative / Positive = Negative; Positive / Negative = Negative. To isolate n in something like [n-8], you need to add 8 to both sides of the equation.
143 + 68 = 211
23.8333