Question

5+6x7-8x(a-9)-76:2=1

Answer 1

5 + 6 * 7 - 8 *  ( a - 9 ) -76 : 2 = 1
5 +  42 - 8 * ( a- 9 ) -36 = 1
5 + 42 - 8a +72 - 36 = 1
47 - 8a - 36 - 1 = 0
47 - 8a - 37 = 0
10 - 8a = 0
-8a = -10    / * (-1)
8a = 10
a = 10 supra 8   / : 2
a = 5 supra 4