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180:(x+7)=15
3*(x+2)=x+8


Răspuns :

180 : (x + 7) = 15
180 = 15(x + 7)
180 = 15x + 105
15x = 75
x = 75 : 15
x = 5
3(x + 2) = x + 8
3x + 6 = x + 8
3x - x = 8 - 6
2x = 2
x = 1