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0.2(900-x)^0.5+0.8(81-x)^0.5=10
We move all terms to the left:
0.2(900-x)^0.5+0.8(81-x)^0.5-(10)=0
We add all the numbers together, and all the variables
0.2(-1x+900)^0.5+0.8(-1x+81)^0.5-10=0
We move all terms containing x to the left, all other terms to the right
0.2(-1x+900)^0.5+0.8(-1x+81)^0.5=10
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