How do you solve #7s-29=-15#?

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Answer 1 · 2017-01-20T12:42:01

#s=2#

Step 1: Have only the 'parts' with s in them on the left of the = and #" "#everything else on the other side.

Step 2: Have only s on the left of = and everything else on the
#" "#other side.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Step 1:

Add #color(red)(29)# to both sides

#color(green)(7s-29=-15" "->" "7s-29color(red)(+29)=-15color(red)(+29#

#" "color(green)(7s+0=14)#

Step 2:
Multiply both sides by #color(red)(1/7)#

#" "color(green)(7/(color(red)(7))s=14/(color(red)(7)))#

But #7/7=1 and 14/7=2# giving:

#" "color(green)(s=2)#