Question

4+1+3×-10=-6+15+1-2×?

6+2-3×+8=-16-4×-30-3×-2?

16+4-10+2×-15=-10+25-×+30?

............×
4+3-5+_=-6+5-4?
............4

-4+15-16+3×-10=-5+30-2×+15-5×?

15+5-8+2×-3=35-×+10-5-×?

Answer 1

$4+1+3x-10=-6+15+1-2x$
$-5+3x=10-2x$
$3x+2x=10-5$
$5x=5$
$x=5/5  x=1$

$6+2-3x+8=-16-4x-30-3x-2$
$16-3x=-44-7x$
$-3x+7x=-44-16$
$4x=-28$
$x=-28/4$
$x=-7$

$16+4-10+2x-15=-10+25-x+30$
$2x-5=45-x$
$2x+x=45+5$
$3x=50$
$x=50/3$
$x=16,6$

$-4+15-16+3x-10=-5+30-2x+15-5x$
$-15+3x=40-7x$
$3x+7x=40+15$
$10x=55$
$x=55/10$
$x=5,5$

$15+5-8+2x-3=35-x+10-5-x$
$9+2x=35-2x$
$2x+2x=35-9$
$4x=26$
$x=26/4$
$x=6,5$