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a fost răspuns

2x+7=3
2(x+1)-7(x-3)=3(x+10)+1x
7x-5=2x+13
7(x-18)=3(x-14)
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Răspuns :

2x+7=3
2x = 3 - 7 = -4
x = - 2
 
2(x+1)-7(x-3)=3(x+10)+1x
2x + 2 - 7x + 21 = 3x + 30 + x
-5x + 23 = 4x + 30
9x = 23 - 30
9x = - 7
x = -7/9

7x-5=2x+13
5x = 13 + 5 = 18
x = 18/5

7(x-18)=3(x-14)
7x - 126 = 3x - 42
4x = 126 - 42 = 84
x = 21
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