Question

75-960:(2в-в+39)=30+5*5

Answer 1

$75 - 960 \div (2b - b + 39) = 30 + 5 \times 5 \\ - 960 \div (b + 39) = 55 - 75 \\ b + 39 = \frac{ - 960}{20} \\ b + 39 = - 48\\ b = - 87$