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f(1.5)=50(1.5)+20
We move all terms to the left:
f(1.5)-(50(1.5)+20)=0
We add all the numbers together, and all the variables
f(1.5)-95=0
We multiply parentheses
1.5f-95=0
We move all terms containing f to the left, all other terms to the right
1.5f=95
f=95/1.5
f=63+0.5/1.5
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