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92(.2)+95(.3)+88(.2)+x(.3)=90
We move all terms to the left:
92(.2)+95(.3)+88(.2)+x(.3)-(90)=0
determiningTheFunctionDomain x(.3)-90+92(.2)+95(.3)+88(.2)=0
We add all the numbers together, and all the variables
x(0.3)-90+92(0.2)+95(0.3)+88(0.2)=0
We add all the numbers together, and all the variables
x(0.3)-25.5=0
We multiply parentheses
0.3x-25.5=0
We move all terms containing x to the left, all other terms to the right
0.3x=25.5
x=25.5/0.3
x=85
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