How do i solve 6x+3=18. and 5(4x-5)=155

6x+3=18
subtract 3 from both sides
6x=15
divide both sides by 6
x=2.5
5(4x-5)=155
distribute the 5
20x-25=155
add 25 to both sides
20x=180
divide both sides by 20
x=9

1) Step 1: Subtract 3 from both sides.

6x+3−3=18−3

6x=15

Step 2: Divide both sides by 6.

6x/6 = 15/6

 when simplified its 5/2

 5/2

2) Step 1: Simplify both sides of the equation.

5(4x−5)=155

(5)(4x)+(5)(−5)=155(Distribute)

20x+−25=155

20x−25=155

Step 2: Add 25 to both sides.

20x−25+25=155+25

20x=180

Step 3: Divide both sides by 20.

20x/20= 180/20 

when simplified its x = 9

x = 9

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.