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4-5x=2*(x+3)-3(3-7)-(8-x)

Răspuns :

4-5x=2*(x+3)-3(x-7)-(8-x)
4-5x=2x+6-3x+21-8+x
4-5x=2x-3x+x+6+21-8
4-5x=3x-3x+19
4-5x=19
4-19=5x
-15=5x
x=-15:5
x=-3