You should use your fingers, head or calculator for such simple sums. It is far quicker and involves fewer key depressions. I could tell you that the answer is 5 but how can you be sure that I did not make a mistake? Or that I am not messing about?
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15.
five
Ten minus nine eights equals eight and seven eighths.
Fourteen minus four equals ten...
X/[5 - (-10)] = 6 x/-15 = 6 x = - 90