How do you solve $4x + 4= 15- 7x$ ?

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Answer 1 · 2017-07-30T20:28:40

$x = 1$

Re-arrange to have all the $x$ terms on one side and the number terms on the other.

ADD $color(magenta)(7x)$ to both sides and SUBTRACT $color(blue)(4)$ from both sides.

$4x+4 = 15-7x$

$4xcolor(magenta)(+7x)+4 color(blue)(-4)= 15color(blue)(-4)-7xcolor(magenta)(+7x)$

This simplifies to what we want:

$4x+7x = 15-4$

$11x =11" "larr div 11$ on both sides

$x = 1$

How do you solve 4x + 4= 15- 7x4x + 4= 15- 7x?