Question

essa tb ñ estou entendendo:
2x+3(4x²+x-1)=12x²

Answer 1

2x+3(4x²+x+1)=12x²
2x+12x²+3x+3=12x²
5x+3=12x²-12x²
5x+3=0
5x=3
x= $\frac{3}{5}$ = 0,6