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bonjour

[tex]2 x - 3 = 4 + x \\2 x - x = 4 + 3\\x = 7 \\\\\\y + 4 = - 4 - 3 y\\y + 3 y = - 4 - 4 \\4 y = - 8\\y = - 2 \\\\\\7 x - 6 = 4 - 3 x \\7 x + 3 x = 4 + 6 \\10 x = 10\\x = 1 \\\\\\12 - a = 18 - 3 a\\- a + 3 a = 18 - 12\\2 a = 6 \\a = 3 \\\\\\- t - 4 = 8 + 7 t \\- t - 7 t = 8 + 4 \\- 8 t = 12\\t = - 12/8 \\t = - 3/2 \\\\13 x + 11 = 8 x + 28 \\13 x - 8 x = 28 - 11\\5 x = 17\\x = 17/5 \\[/tex]

Bonjour,

2x-3=4+x ⇒ 2x-x=4+3 ⇒ x=7

y+4=-4-3y ⇒ y+3y=-4-4 ⇒ 4y=-8 ⇒y=-8/4 = -2

7x-6=4-3x ⇒ 7x+3x=4+6 ⇒ 10x=10 ⇒ x=10/10=1

-t-4=8+7t ⇒ -t-7t=8+4 ⇒ -8t=12 ⇒t=-12/8=-3/2

13x+11=8x+28 ⇒ 13x-8x=28-11 ⇒ 5x=17 ⇒x=17/5

5x=0 ⇒ x=0/5=0

7y+22=14-4y ⇒ 7y+4y=14-22 ⇒ 11y=-8 ⇒ y=-8/11

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