Помогите решить уравнение;4(9+7х)+21=393 и 486:(5x+2)=18

4(9+7х)+21=39336+28х+21=39328х=393-36-2128х=336х=336:28х=12486:(5х+2)=185х+2=486:185х+2=275х=27-25х=25х=25:5х=5

4(9+7х)+21= 39336 + 24 х + 21 = 39328х= 393-36-2128х=336х=12-----486:(5х+2)=185х+2=486:185х+2=275х=27-25х=25х=5