Solve 5(x + 3) < 60

For this we must expand the bracket:5(x+3)= 5x+15and then we rearrange for 'x':x<9

OA

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Solve the following simultaneous equations: 2x - y = 7 and x^2 + y^2 = 34


5x-7 = 3x + 3, solve x


Consider f:R -> R, f = x/ sqrt(x^2+1). Prove that for any a between -1 and 1, f(x)=a has only one solution.


Expand and simplify: 5(x + 3) - 3(y - 2)