1) 7(х + 8) - 25 = 66 2) 9(5х + 13) = 252
7(х + 8) = 66 + 25 5х + 13 = 252 : 9
7(х + 8) = 91 5х + 13 = 28
х + 8 = 91 : 7 5х = 28 - 13
х + 8 = 13 5х = 15
х = 13 - 8 х = 15 : 5
х = 5 х = 3
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3) 15(13х - 7) = 285 4) (у + 46) : 3 = 18
13х - 7 = 285 : 15 у + 46 = 18 · 3
13х - 7 = 19 у + 46 = 54
13х = 19 + 7 у = 54 - 46
13х = 26 у = 8
х = 26 : 13
х = 2
5) (2х + 39) : 5 = 13 6) 182 : (х - 15) = 14
2х + 39 = 13 · 5 х - 15 = 182 : 14
2х + 39 = 65 х - 15 = 13
2х = 65 - 39 х = 13 + 15
2х = 26 х = 28
х = 26 : 2
х = 13
1) 7(х + 8) - 25 = 66 2) 9(5х + 13) = 252
7(х + 8) = 66 + 25 5х + 13 = 252 : 9
7(х + 8) = 91 5х + 13 = 28
х + 8 = 91 : 7 5х = 28 - 13
х + 8 = 13 5х = 15
х = 13 - 8 х = 15 : 5
х = 5 х = 3
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3) 15(13х - 7) = 285 4) (у + 46) : 3 = 18
13х - 7 = 285 : 15 у + 46 = 18 · 3
13х - 7 = 19 у + 46 = 54
13х = 19 + 7 у = 54 - 46
13х = 26 у = 8
х = 26 : 13
х = 2
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5) (2х + 39) : 5 = 13 6) 182 : (х - 15) = 14
2х + 39 = 13 · 5 х - 15 = 182 : 14
2х + 39 = 65 х - 15 = 13
2х = 65 - 39 х = 13 + 15
2х = 26 х = 28
х = 26 : 2
х = 13