Răspuns:
Explicație pas cu pas:
a)
2(2x + 5) = 11(3x - 7)
4x + 10 = 33x - 77
33x - 4x = 10 + 77
29x = 87
x = 87 : 29 = 3
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b)
2(4x + 11) = 3(5x - 9)
8x + 22 = 15x - 27
15x - 8x = 22 + 27
7x = 49
x = 49 : 7 = 7
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c)
14(4x - 5) = 3(3x + 8)
56x - 70 = 9x + 24
56x - 9x = 70 + 24
47x = 94
x = 94 : 47 = 2
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d)
9(3x - 7) = 15(2x - 6)
27x - 63 = 30x - 90
30x - 27x = 90 - 63
3x = 27
x = 27 : 3 = 9
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e)
3(8x - 5) = 19(5x - 12)
24x - 15 = 95x - 228
95x - 24x = 228 - 15
71x = 213
x = 213 : 71 = 3
f)
36(4x - 5) = 28(3x + 15)
144x - 180 = 84x + 420
144x - 84x = 180 + 420
60x = 600
x = 600 : 60 = 10
