-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
4b
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.
Since b2 is doubled by adding 3, b2 equals 3. 1/2 of that is b, hence b=1-1/2.
The answer to 6b plus 7 times 5-4b plus 1 equals 38. This is taught in math.
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