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6x+6-4=3(x+2)-10
6x+2 = 3x+6-10
6x-3x = 6-10-2
3x =-6
x = -2
comprobación (sustituyes x=-2) -12+6-4=-10 ⇒ -10 = -10
B)
(3x-1)²+4x=9x²+7
9x²-6x+1+4x = 9x²+7
9x²-2x-9x² = 7-1
-2x = 6
x=-3
comprobación (sustituyes x=-3) ⇒
(-9-1)² -12 = 9(9) + 7 ⇒ 100-12 = 81+7 ⇒ 88=88
C)
5-8x+36x²=(1-6x)²
5-8x+36x² = 1 - 12x + 36x²
36x²-8x-36x²+12x = 1-5
4x = -4
x= -1
comprobación (sustituyes x=-1) ⇒ 5+8+36 = (1+6)² ⇒ 49 = 49
D)
(3x+4)²=(-2+3x)²
9x²+24x+16 = 4-12x+9x²
9x²+24x-9x²+12x = 4-16
36x =-12
x= - 1/3
comprobación (-1+4)² = (-2-1)² ⇒ 9 = 9