Х + (590 - 320) = 400 • 2 - 30
х+590-320=770
х=770-590+320
х=500
x+270=770
x=770-270
x=500
500+270=770
770=770
Х + (590 - 320) = 400 • 2 - 30
х+590-320=770
х=770-590+320
х=500
x+270=770
x=770-270
x=500
500+270=770
770=770