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Explanation:
-7x+8=19
-7x=19-8
-7x=11
x=11/7
2/7x-6=16
2/7x=16-6
2/7x=10
x=10×2/7
x=20/7
30(p+3)=120
p+3=120/30
p=4-3
p=1
8p-9=-3p+2
8p+3p=2+9
11p=11
p=11/11
4x+5=2x+11
4x-2x=11-5
2x=6
x=6/2
x=3