Question 1024435
{{{ x/21 = (-15) / (-35) }}}
It would help to simplify the right side
(-) / (-) = (+)
{{{ x/21 = 15/35 }}}
Divide top and bottom of right side by {{{ 5 }}}
{{{ x/21 = 3 / 7 }}}
Multiply both sides by {{{ 7 }}}
{{{ x/3 = 3/1 }}}
Multiply both sides by {{{ 3 }}}
{{{ x = 9 }}}
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check answer:
{{{ x/21 = (-15) / (-35) }}}
{{{ 9/21 = (-15) / (-35) }}}
Now I will just use calculator:
{{{ .42857 = .42857 }}}
OK