Question

Qual é a raiz das equações: a) 5x - 3 =2x + 9
b) 3 (2x - 3) + 2 (x + 1) = 3x + 18

Answer 1

a) 5x - 3 =2x + 9
5x-2x=9+3
3x=12
x=12÷3
x= 4
b) 3X2x-3X3+2x(x+1)=3x+18
6x-3X3+2x(x+1)=3x+18
6x-9+2x(x+1)=3x+18
6x-9+2xX+2x1=3x+18
6x-9+2xX+2=3x+18
6x-9+2x+2=3x+18
8x-9+2=3x+18
8x-7=3x+18
5x=18+7
5x=25
x=25÷5
x=5