7^ 2x -2*7^x+1=0
x^2 -4x +1
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x^2-x-15
X+((195-X)/2)+(2929+((195-X)/2))=3124
3(2x-1)-2(x+7)+1
2x-y=46
x+y=65
Find the value of 2x²-3xy when x=√2+3 and y=√2-2
2x-y=27
2x+3y=11
4x+2y=10
42*3+12^2-8/5
