Question

Х+325=189×4 900-х=129×4

Answer 1

$x + 325 = 189 \times 4 \\ \times + 325 = 756 \\ x = 756 - 325 \\ x = 431.$

$900 - x = 129 \times 4 \\ 900 - x = 516 \\ x = 900 - 516 \\ x = 384$