5(17х+12)+3(42-21)=406 упростите пж

Question

5(17х+12)+3(42-21)=406 упростите пж

Answer 1

85х+60+126-63=406
85х+(186-63) =406
85х +123 = 406
85х = 406-123
85х= 283
х= 283:85
х = 3 28/85