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60=80x-60x
60=20x
60/20=x
30=x
te ayudo con la primera va
60=80x-60x
60=20x
x=60/20
x=3
7+2.5x=12+1.5x
2.5x-1.5x=12-7
x=5
0.4(x+200)=900
0.4x+800=900
0.4x=900-800
0.4x=100
x=100/0.4
x=250
3(2+x)=3x+6
6+3x=3x+6
3x-3x=6-6
0=0←Verdadero para todo x.
2x+4y=22
3x+2y=21
2x+4y=22
-2(3x+2y)=-21
2x+4y=22
-6x-4y=42
-----------------
-4x 0 = 64
x=64/-4
x=-16
2(-16)+4y=22
-32+4y=22
4y=22+32
4y=54
y=54/4
y=27/2
x=-16
y=27/2
Espero que sirva!Saludos!