Resolva os sistemas abaixo,pelo método de substituição
a) {x+y=6
{x=2y

b) {x-y=4
{2x-3y=6

c) { 7x+y=38
{x-2y= -16

d) {x-y= - 5
{8x+5y=12

e) {2x+5y=7
{3x-2y= - 0,9
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