Question

решите ур-ва
х+(х+12х)+(х-40)=710

Answer 1

x+x+12x+x-40=710
3x+12x=710+40
15x=750
x=50

Answer 2

$x+(x+12x)+(x-40)=710\x+x+12x+x-40=710\2x+13x=710+40\15x=750\x=50\\50+50+600(12*50=600)+50-40=\100+610=710$