Ответы на вопрос:
1) 5х+4х=405
9x = 405
x = 45
2) 24х-х=529
23x = 529
x = 23
3) 9(х-15)=72
9x-135 = 72
9x = 72+135
9x = 207
x = 23
4) (3х-8)16=448
48x-128 = 448
48x = 448+128
48x = 576
x = 12
5) 24(14+х)=816
336+24x = 816
24x = 816-336
24x = 480
x = 20
6) (5х+24): 8=13
5x+24 = 13*8
5x+24 = 104
5x = 104-24
5x = 80
x = 16
7) 48: (х+4)=8
x+4 = 48: 8
x+4 = 6
x = 2
8) 12х+4х-48=256
12x+4x = 256+48
16x = 304
x = 19
9) 48: х+4=8
48: x = 12
x = 4
10) 16x+x-7x+27=217
16x+x-7x = 217-27
10x = 190
x = 19
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