Question

determinați x știindu-se ca ax+3bx+7x=380. și 2a+6b+14=152 pls repede

Answer 1

ax+3bx+7x=380
x(a+3b+7)=380
observam ca a+3b+7=(2a+6b+14):2=152:2=76, deci
x×76=380
x=380:76=5

Answer 2

ax+3bx+7x= 380   |×2

2ax+6bx+14x=760  ⇔ x(2a+6b+14)=760

                                             ⇵

                                     x *  152 = 760

                                    x = 760:152 = 5