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Rezovati :2*X +4*X+6*X+8*X+10*X-13 <X+3*X+5*X+7*X+9*X+12   *=inmultit (ori ) VA ROOG REPEEEEDEEE!!!!

Răspuns :

2X(1+2+3+4+5)-13=2X*15-13=30X-13

2*X +4*X+6*X+8*X+10*X-13 <X+3*X+5*X+7*X+9*X+12 
30X-13<25X+12
30X-25X<12+13
5X<25
X<25:5
X<5