tentukan nilai dri soal dibawah ini: 4x-5(x-3)=4(x-5)-7(x+1)

4x - 5(x-3) = 4(x-5) - 7(x+1)
4x - 5x + 15 = 4x - 20 - 7x -7
4x - 5x - 4x + 7x = - 20 - 7 - 15
-x - 4x + 7x = -27 - 15
-5x + 7x = -42
2x = - 42
x = - 42/ 2
x = - 21

selesai.