1.
2x-9=7
2x=9+7
2x=16
x=8
2.
x+3b=-19
8+3b=-19
8+19=-3b
27=-3b
-3b=27
3b=-27
b=-9
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Answers & Comments
1.
2x-9=7
2x=9+7
2x=16
x=8
2.
x+3b=-19
8+3b=-19
8+19=-3b
27=-3b
-3b=27
3b=-27
b=-9