Question 648445
{{{x^2 + 3x^2 - 4^2}}}
Treat all x^2 as a single combinable variable
{{{4x^2 - 4^2 or highlight_green(4x^2 - 16)}}}
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If you meant {{{x^2 + 3x^2 - 4x^2}}}, then
{{{4x^2 - 4x^2 = 0}}}
there will not be a {{{x^2}}} variable
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