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3x-7. = x+3
3x-x = 3+7
2x = 10
x = 5
remplazamos en las ecuaciones
3x-7 = x+3
3(5)-7 = 5+3
15-7 = 8
8 = 8
x+3 = 18-2x
5+3 = 18-2(5)
8. = 18-10
8 = 8
R/ los lados. de el triangulo miden 8