X-1,3=78,474÷9,02
x-1,3=8,7
x=8,7+1,3
x=10
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x=2^2
x=4
- 0,6 * ( 1,6b - 5 ) - ( 2,9b - 8 ) - 4 * ( 4 - 1,5b ) = - 0,96b + 3 - 2,9b + 8 - 16 + 6b = - 3,86b + 6b + 11 - 16 = 2,14b - 5
b = - 9/13
2,14 * ( - 9/13 ) - 5 = - ( 107/50 ) * ( - 9/13 ) - 5 = + ( 963/650 ) - 5 = 1 ( 313/650 ) - 5 = - 3 ( 337/650 )