Ответы на вопрос:
1)3(7 + 4x) - 8x = 201
21 + 12x -8x = 201
4x = 201 - 21
4x = 180
x = 45
2) 770 : (4x+18x) - 12 = 23
770 : 22x = 23 + 12
770 : 22x = 35
22x = 770 : 35
22x = 22
x = 1
3) 2(6x+ 8) - 3x = 313
12x + 16 - 3x = 313
9x = 313 - 16
9x = 297
x = 33
4) 630 : (63x - 42x) +53 = 68
630 : 21x = 68 - 53
630 : 21x = 15
21x = 630 : 15
21x = 42
x = 2
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