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Step-by-step explanation:
2x+1x= -2+1
3x= -1
3x÷3= -1÷3
x=|-3.3333..|=3.33333.. or

LHS: =

(using

)
We know

so we can replace the sin²x in the LHS expression as follows

which is the RHS.
Find 20% first
20% of 84 is 16.8
tax is 7% of 84 which is 5.88
total
84+16.8+5.88=$106.68