8 + 91 = 99
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91 inches+8ft 8 times 12=96 96+91=187 inches
91+8=99 Hope I helped. :)
2x+5=-91-10x 12x+5=-91 12x=-96 x=-8
91 is the dialling code for India. So you would add plus 91 (normally not plus plus 91) to dial a mobile with an Indian number. The phone need not be in India.
6+6+6+(81-91)+1000; First add together the sixes 18+(81-91)+1000; Next we add the terms in parenthasis 18+(-10)+1000; Since we have a negative 10, we chang the sign to minus 18-10+1000; Now we subtract 18-10 8+1000; Finally, 1000+8 = 1008 1008