Question 1112237

solve {{{ A=(1/2) h(b[1]+b[2]) }}} for the variable {{{b[1]}}}

{{{ 2A=2(1/2) h(b[1]+b[2]) }}} ...both sides multiply by {{{2}}}

{{{ 2A= h(b[1]+b[2]) }}}...divide by {{{h}}}

{{{ 2A/h= h(b[1]+b[2])/h }}}

{{{ 2A/h= b[1]+b[2] }}}...add {{{-b[2]}}}

{{{ 2A/h -b[2]= b[1]+b[2]-b[2] }}}

{{{ 2A/h -b[2]= b[1] }}}

so, {{{b[1]= 2A/h -b[2]  }}}