Question

preciso simplificar e resolver as equações podem me ajudar

a) 9+2.(5x-4)=21

b) 3.(5+3x)+5.(-x-1)=22

Answer 1

a) 9+2.(5x-4)=21
9+10x-8=21
10x=21+8-9
10x=21-1
10x=20
x=20/10
x=2
b) 3(5+3x)+5(-x-1)=22
15+9x-5x-5=22
9x-5x=22+5-15
4x=22-10
4x=12
x=12/4
x=3