Question

уравнение. 84a+25a+7=443. 4(9+7x)21=393. 486:(5x+2)=18. 5(14+ b)+6b=258

Answer 1

1) 109а+7=443
109а=443-7
109а=436
а=4
2) 84(9+7х)=393
756+588х=393
588х=393-756
588х=-363
х=-363/588
х=-121/196
3) 486/5х+2=18, х не = -2/5
486=18(5х+2)
486=90х+36
-90х=36-486
-90х=-450
х=5
4) 70+5b+6b=258
70+11b=258
11b=258-70
11b=188
b=188/11