135=3s +15 120=3s 40=s
s = 4
s = 15
5s - 3 = 3s - 92s = -6s = -3
3 + .3 + .33
20
-7 = 3s - 1 +1 +1 (add 1 to both sides to get the variable alone) ___ ____ -6 = 3s __ ___ (-6 and 3s both divided by 3) 3 3 -2 = s
decomposition
math
3.5111
2Al+3S--->Al2S3
2s + s + 12 =132 ie 3s = 132 -12 3s = 120 s = 40