Question

a) 4(X+2X)-7(2X+X)+5


b) 4X+8X=14X+7X.

c)5X-3X=7X+X

D)2(X+10)=3(5X-1)

PRECISO DAS CONTAS RESOLVIDAS

Answer 1

b) 4X+8X=14X+7X
12X = 21X ⇔ 21X = 14X ⇔ 21X -14X = 0 ⇔ 7X = 0 ⇔ X = 0/7 ⇔ X = 0

c) 5X-3X=7X+X
 2X=8X ⇔ 8X = 2X ⇔ 8X - 2X = 0 ⇔ 6X = 0 ⇔ X = 0/6 ⇔ X = 0

d) 2(X+10)=3(5X-1)
 2(X+10)=3(5X-1) ⇔ 2X + 20 = 15X -3 ⇔ 15X - 3 = 2X + 20 ⇔
15X - 2X = 20+3 ⇔ 13X = 23 ⇔ X = 23/13

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Obrigado pela oportunidade 
Boa sorte, bons estudos!
SSRC - ♑ - 2015 
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Answer 2

            a)
                    4(x + 2x) - 7(2x + x) + 5
                  = 4(3x) - 7(3x) + 5
                  = 12x - 21x + 5
                  = - 9x + 5

           b)
                  4x + 8x = 14x + 7x
                        12x ≠ 21x     NÃO É IGUALDADE

           c)
                  5x - 3x = 7x + x
                         2x ≠ 8x        NÃO É IGUALDAE

           d)
                  2(x + 10) = 3(5x - 1)
                     2x + 20 = 15x - 3
                    2x - 15x = - 3 - 20
                         - 13x = - 23
                               x = - 23/- 13
                               x = 23/13