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1.78=890r*0.6
We move all terms to the left:
1.78-(890r*0.6)=0
We add all the numbers together, and all the variables
-(+890r*0.6)+1.78=0
We get rid of parentheses
-890r*0.6+1.78=0
Wy multiply elements
-534r+1.78=0
We move all terms containing r to the left, all other terms to the right
-534r=-1.78
r=-1.78/-534
r=1/300
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