How do you solve $3(x+ 5) +x=7$ ?

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Answer 1 · 2016-03-08T23:21:21

Same thing with a slightly different twist

$x=-2$

Given $" "3(x+5)+x=7$

Multiply out the bracket

$color(brown)(" "3x+15+x=7)$

$color(brown)(" "4x+15=7)$

Subtract 15 from both sides

$color(brown)(" "4x=-8)$

Divide both sides by 4

$color(blue)(" "x=-2)$

How do you solve 3(x+ 5) +x=73(x+ 5) +x=7?