Răspuns:
Explicație pas cu pas:
1)7x-14=5x-2
7x - 5x = 14 - 2
2x = 12
x = 12/2 = 6
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2)5(x+1)=2(x-1)
5x + 5 = 2x - 2
5x - 2x = -5 - 2
3x = -7
x = -7/3
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3)2(2x-5)=3(x-2)+7
4x - 10 = 3x - 6 + 7
4x - 10 = 3x + 1
4x - 3x = 10 + 1
x = 11
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4)4(x-7)=5(x+1)+10x
4x - 28 = 5x + 5 + 10x
4x - 28 = 15x + 5
15x - 4x = -28 - 5
11x = -33
x = -33/11 = -3