1-23+4-56+789=715
1*234+56*7+89=715
1*2+34+56+7*89=715
1+23*4+5-6+7*89=715
1*2-3+4+56/7*89=715
1+2*3-4+56/7*89=715
1-2+34-5+678+9=715
1+2*3*4*5*6-7-8+9=715
1*2*345+6*7-8-9=715
1+2*34-56+78*9=715
1+2+3-4+5+6+78*9=715
1*2*3-4+5+6+78*9=715
1*2+3*4+5-6+78*9=715
12+3*4-5-6+78*9=715
1*2*3*4-5-6+78*9=715
1*2-3+4*5-6+78*9=715
1+2+3*4*5/6+78*9=715
12*3*4*5+67-8*9=715