Question

N= 12u + 7
N= 4u + R



Resolva para R

Answer 1

N= 12u + 7
N= 4u + R

N1 = N2 ==> 12u + 7 = 4u + R

R =  12u - 4u + 7 ==> R = 8u +  7

Answer 2

$\left \{ {{N=12u+7} \atop {N=4u+R }}$

$12u+7 = 4u+R \\ \\ 12u+7 -4u= R \\ \\ \boxed{ 8u+7= R}$

Até outra vez!!!!