jika k merupakan penyelesaian dari 5 (7x - 4) = - 3(- 9x + 12)+8 nilai k - 7 adalah?

jawab
persamaan linier

5(7x-4) = -3(-9x +12) + 8
35x -20  = 27x - 36 + 8
35x - 20 = 27x - 28
35x - 27x = - 28 + 20
8x = -8
x= - 1
k=x =-1
nilai k- 7 = -1 - 7 = - 8

5(7x-4) = -3 (-9x + 12) +8
35x - 20 = 27x -36 +8
35x -27x = 20 - 28
8x = -8
x = -8/8
= -1

jadi, k - 7 = -1 - 7 = -8