tentukan himpunan penyelesaianya

3) 5x - 4 = 6
5x = 6 + 4
x = 10/5 = 2
atau
5x - 4 = -6
5x = -6 + 4
x = -2/5
hp {-2/5 , 2}

4) 7x - 4 = 3
7x = 3 + 4
x = 7/7 = 1
7x - 4 = -3
7x = -3 + 4
x = 1/7
hp {1/7 , 1}