4b plus 7b plus 5 will equal 11b plus 5. When you have two variables that are the same you can add the two numbers with the variables remaining the same.
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2a + 4b - 52a + 4b - 52a + 4b - 52a + 4b - 5
its a quadratic equation. (4b-5) (4b-5)
7 + 4b + 3b + 6b + 5 =7 + 13b + 5 =12 + 13b
The answer to 6b plus 7 times 5-4b plus 1 equals 38. This is taught in math.
if i think of it, a=4b though a =20 so 20=4b 4 x 5=20 so b would equal five 4B/4=20/40 B=5 4(5)=20