Find the value of x.

4. x=10

5. x=15

6. x=20

7. x=4

Step-by-step explanation:

4. 50+4x=90

90-50=40

40/4=10

x=10

5. (2x+60)+6x=180

6x+2x=8x

8x+60=180

180-60=120

8x=120

120/8=15

x=15

6. 3x+30=90

90-30=60

60/3=20

x=20

7. (8x+120)+7x=180

8x+7x=15x

15x+120=180

180-120=60

15x=60

60/15=4

x=4

i think is 3 and 6. this took me 10 min to think.hope to and hope that my answer is brainliest.(follow me )