exam Maths Puzzle Numerical Ability

please help me solve this equation: if 3x-1=11, what is the value of 2x+x?
Thank you all in advance!!!!!!

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exam Other Question

what is 6(c-1)<-18 looking for more help please, Thank you...
Given f(x) = x^2 - 8x - 20 equation (parabola), find the following:

21.) The vertex

22.) The y-intercept(s)