1. 2(a + 6) - 12 - a = 19 simplify then solve

2. -(2a + 3) + 3 + 9a = 14 simplify then
solve

3. -3(a - 5) + 7a - 15 = 16 s then s

4. 5(a - 1) + 8a + 5 = 78 sts

5. 3a + 2(a - 6) + 12 = 15

Let's solve your equation step-by-step.

2(a+6)−12−a=19

Step 1: Simplify both sides of the equation.

2(a+6)−12−a=19

(2)(a)+(2)(6)+−12+−a=19(Distribute)

2a+12+−12+−a=19

(2a+−a)+(12+−12)=19(Combine Like Terms)

a=19

a=19

a=19

Step-by-step explanation:

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

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step-by-step explanation:

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