Question

(45:x+76)*4=28*13 решите п/ж​

Answer 1

(45:х+76)×4=28×13

(45:х+76)×4=364

45:х+76=364:4

45:х+76= 91

45:х=91-76

45:х=15

х=45:15

х=3

(45:3+76)×4=28×13

Answer 2

$(45 \div x + 76) \times 4 = 28 \times 13 \\ ( \frac{45}{x} + 76) \times 4 = 364 \\ \frac{180}{x} = 364 - 304 \\ \frac{180}{x} = 60 \\ 180 = 60x \\ x = 3$