Question

Me ajudem no caso entre segmentos de reta secantes. 21(x+21)=5(15+5)

Answer 1

21x+441=75+25
21x=100-441
21x= -341
x= -341/21

Answer 2

21*(x+21) = 5*(15+5) 
21x + 441 = 75+ 25 
21x= 75+25-441
21x= - 341
x= -341 / 21
x=