Question 1177396
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Mia is 4 less than 3 times kristina’s age. Six years from now, mia will be 7 more than twice kristina’s age. How old will mia be 6 years from now?
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Follow the description and the question exactly how they are written.


M Mia
K Kristina

{{{system(M=-4+3K,M+6=7+2(K+6))}}}


and question asks for M+6.  
Handle the rest any way you know how; basically simple algebra steps.

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{{{M+6=7+2K+12}}}
{{{M=2K+12+1}}}
{{{M=2K+13}}}
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{{{M=3K-4=2K+13}}}
{{{K=13+4}}}
{{{highlight_green(K=17)}}}
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{{{M+6=2K+19}}}{{{by}}}{{{substitution}}}:
{{{M+6=34+19}}}
{{{highlight(M+6=highlight(53))}}}