Solve for x
x=7
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31x-12+9+90+8x=360
Combine 21x and 10x to get 31x.
31x-3+90+8x=360
Add -12 and 9 to get -3.
31x+87+8x=360
Add -3 and 90 to get 87.
39x+87=360
Combine 31x and 8x to get 39x.
39x=360-87
Subtract 87 from both sides.
39x=273
Subtract 87 from 360 to get 273.
x=\frac{273}{39}
Divide both sides by 39.
x=7
Divide 273 by 39 to get 7.
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