It is given in the question that B is in between C and D.
Therefore

Substituting the given values of CB,BD and CD, we will get

Combining like terms, we will get

Now we need to move 4 to the right side by adding 4 to both sides, that is

6)
80+160+100+8x+8+5x+10=540
13x + 358 = 540
13x = 540 -358
13x = 182
x = 182/13
x = 14
answer x =14
7)
7x+13=8x-8
8x-7x=13+8
x = 21
answer x = 21
Answer:
tan is opposite over adjacent
tan A = 6/8
90 flowers in all,
90 x .60 = 54
Comment if this isn't the answer your looking for.
-2+3x=2x+6+x
-2+3x= 3x+6
-3x = -3x
-2=6
No solution! -2 doesn’t not equal 6
Steps
1. Combine like terms( example combine like terms on the right side of the equation)
2. Subtract or add variable from one side
3. You get the answer