Question

resolva essas equçoes
7(x+10)-8(x+8)
6(x-3)-9(x_5)=x_1
preciso da conta tb

Answer 1

olá...

7(x +10) -8(x +8) =
7.x +7.10 -8.x -8.8 =
7x +70 -8x -64 =
7x -8x = -70 +64
     - x  = -6 (-1)
       x  =  +6


6(x -3) -9(x -5) = x -1
6.x +6.-3 -9.x -9.-5 = x -1
6x -18 -9x +45 = x -1
6x -9x -x = -1 +18 -45
6x -10x = 18 -46
     -  4x = - 28
          x = -28 / -4
          x = +7