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6×(2x+6)=15×(x+1) pls repede

Răspuns :

6(2x+6)=15(x+1)
12x+36=15x+15/-15
12x+21=15x/-12x
21=3x/:3
x=7
6x(2X+6)=15x(X+1)
6x2X+36=15X +15
12X+36=15X+15
36-15=15X-12X
21=3X
X=21:3=7