3*(x+199)=939
3x + 597 = 939
3x = 939 – 597
3x = 342
x = 114
666:(x-115)=6
x-115=666:6
x-115=111
x=111+115
х=226
(223-x)*5=605
раскроем скобки
1115-5x = 605
-5x+510 = 0
5x-510 = 0
5x = 510
x = 102
822:(x-198)=3
x-198=822:3
x-198=274
x=274+198
х=472
7*(297-x)=147
2079 – 7x = 147
– 7x = 147 – 2079
-7x = -1932
x = 276
624:(x+23)=4
x+23=624:4
x+23=156
x=156-23
х=133
3*(x+199)=939
3x + 597 = 939
3x = 939 – 597
3x = 342
x = 114
666:(x-115)=6
x-115=666:6
x-115=111
x=111+115
х=226
(223-x)*5=605
раскроем скобки
1115-5x = 605
-5x+510 = 0
5x-510 = 0
5x = 510
x = 102
822:(x-198)=3
x-198=822:3
x-198=274
x=274+198
х=472
7*(297-x)=147
2079 – 7x = 147
– 7x = 147 – 2079
-7x = -1932
x = 276
624:(x+23)=4
x+23=624:4
x+23=156
x=156-23
х=133