Решите уравнения  3x+7x+18=178  6y-2y+25=65 7z+6z-13=130 21t-4t-17=17                

3x+7x+18=178 10x+18=178 10x=178-18 10x=160 x=160/10 x=16 ------------------------------ 6y-2y+25=65 4y+25=65 4y=65-25 4y=40 y=40/4 y=10 ____________________________ 7z+6z-13=130 13z-13=130 13z=130+13 13z=143 z=143/13 z=11 _______________________________ 21t-4t-17=17 17t-17=17 17t=17+17 17t=34 t=34/17 t=2