Question

determine o valor da letra 5x+9+7x=15
87x-2=88x+9​

Answer 1

5x+9+7x=15

5x+7x=15-9

12x=6

x=6/12

x=0,5

87x-2=88x+9

-2=88x-87x+9

-2=x+9

x=-2-9

x=-11