book Maths Puzzle Numerical Ability

can u solve this?
6r^3+7r^2=r
thank you

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book Other Question

Write the equation of the line in slope-intercept form.

(1.5, 2.8) m=0
Hi,

I need help with finding the LCM
x^2+x-6;x^2+8+15;x^2-25

Thanks