mohon di jawab harus ngumpul besok 1; 5p-8=7p+12 2; 7n-5=5n+9 3; 1/2x+3=9 4; 1/4y+1/2=7 tolong di jawab secepat nya

1. 5p-8 = 7p + 12
5p-7p = 12+8
-2p = 20
p = 20 : -2 = -10

2. 7n-5 = 5n+9
7n- 5n = 9+5
2n = 14
n = 14 : 2
n = 7