Question

Calcule as equações a) 5x-8= 4x+20
B)7(x-3)= 8x+18= c)5(x-4)=4(x-5)

Answer 1

a) 5x-8= 4x+20
5x-4x= 20+8
x= 28

B)7(x-3)= 8x+18
7x-21 = 8x+18
-21+18= 8x-7x
-3=x

c)5(x-4)=4(x-5)
5x-20 = 4x-20
5x -4x=0
x=0