Question 63407
Great start to #1
Picking up where you left off ....
{{{ 7m - 15m = 32 }}}
add the m terms
{{{ -8m = 32 }}}
divide by -8
{{{ m = -4 }}}


2. {{{ (2y + 5)- (y + 3) + (7y - 3y) = 17 }}}
distribute the understood -1 with the second quantity and get rid of the ( )
{{{ 2y + 5 -1y -3 + 7y -3y = 17 }}}
add all the y values
{{{ 5y + 5 - 3 = 17 }}}}
add the constants 
{{{ 5y + 2 = 17 }}}
subtract 2 from both sides
{{{ 5x = 15 }}}
divide by 5
{{{ x = 3 }}}


3. {{{ 2(k + 3(k - 1)) = 18 }}}
Start with distributing the 3 
{{{ 2(k + 3k - 3) = 18 }}}
Add like terms within the ( )
{{{ 2(4k -3) = 18 }}}
Distribute the 2
{{{ 8k -6 = 18 }}}
add 6 to both sides
{{{ 8k = 24 }}}
divide by 8
{{{ k = 3 }}}


4. {{{ -4.5 = 5n - n - n }}}
add like terms on the right
{{{ -4.5 = 3n }}}
divide by 3
{{{ -1.5 = n }}}