15/x=y/6
4x + 3y = 32; 2x - 7y = -18
1/3=2/b
1/3=2/b+1
0.4x - 0.7y = -13; 0.6x + 0.7y = 33
3−1+3×6÷3−1
0.4x - 0.7y = -130; 0.6x + 0.7y = 330
if set of prime number 2'3'5... then fillthe blank using thesymbols
3 p
x²+2x-5=0
10÷19/5