-86
identity.
5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21
4b + 3 = 15 First, Subtract 3 from both sides. -3 -3 4b = 12 Then, divide by 4 to get b by itself. 4 4 b = 3
2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
-4b+2 = 18 -4b = 18-2 -4b = 16 b = -4
36 -20 = 16
The best plan for that particular equation would be to first subtract 15 from each side, and then apply the quadratic formula.
The answer to 6b plus 7 times 5-4b plus 1 equals 38. This is taught in math.
Since b2 is doubled by adding 3, b2 equals 3. 1/2 of that is b, hence b=1-1/2.
2
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1