112 supra 100 *x=56=>112x=5600=>x=50
70 supra 100*x=28=>70x=2800=>x=40
3x=x+10=>2x=10=>x=5
15-2x=6*1 supra 2*x=>15-2x=3x=>5x=15=>x=3
x patrat+x-12-6x+4=x patrat-8x+16=>3x=24=>x=8
x patrat+7x+10-12x+9=x patrat-10x+25=>5x=6=>x=6 supra 5
x patrat+2x-13=x patrat -9=>2x=4=>x=2
4x patrat-4x=4x patrat-25+1=>-4x=-24=>x=6