Question

Determine a raiz ou solução das questões:
a) 5x - 7 = 3x - 10
b) 15x-13= -39 - 11x
c) 7x+11= 15 + 5 x
d) 21+9x = 15x+33

Answer 1

a) 5x -7=3x -10 ==> 5x -3x= -10 +7 ==> 2x= -3 ==> x= -3/2
b) 15x -13 = -39 -11 ==> 15x+11x = -39+13 ==> 26x = -26 ==> x= -1
c) 7x+11 = 15+5x ==> 2x = 4 ==> x= 4/2 ==> x= 2
d) 21+9x = 5x+33 ==> 9x -5x = 33-21 ==> 4x= 12 ==> x= 12/4 ==> x= 3