jawab dong nomor 4,5,6,7

{..5..} 3x-2 = 19
3x = 19+2
3x =21
x = 21/3
x = 7 [a]

{..6..} 5-2y : 117
-2y : 117-5
-2y : 112
y : 112/-2
y : 56[c]

{..7..} 3(m-1) +5 = m+10
3m -3 +5 = m +10
3m +2 = m+10
3m -m = 10-2
2m = 8
m = 8/2
m = 4 [d]