Răspuns:
Explicație pas cu pas:
2x + 5 = 7 + x
2x - x = 7 - 5
x = 2
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3 - 7x = 2x + 21
2x + 7x = 3 - 21
9x = -18
x = -18 : 9 = -2
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1 - 4x = x + 16
4x + x = 1 - 16
5x = -15
x = -15 : 5 = -3
7 - 5x = 2x - 7
5x + 2x = 7 + 7
7x = 14
x = 14 : 7 = 2
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7 - 2x = 5x - 14
5x + 2x = 7 + 14
7x = 21
x = 21 : 7 = 3
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9x - 4 = 5x + 8
9x - 5x = 4 + 8
4x = 12
x = 12 : 4 = 3
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5x - 1 = 8x + 11
8x - 5x = -1 - 11
3x = -12
x = -12 : 3 = -4
3x - 1 = 5x + 9
5x - 3x = -1 - 9
2x = -10
x = -10 : 2 = -5
6x - 5 = 3x + 7
6x - 3x = 5 + 7
3x = 12
x = 12 : 3 = 4
