A) 2(x+3)=x-4
b) 4(5x-2)=2(9x+3)

Step-by-step explanation:

a.2x+6=x-4

2x-x=-4-6

x=-10

b.20x-8=18x+6

20x-18x=14

2x=14

x=7

c. 65°

step-by-step explanation:

we are given a triangle with two known angles, 62° and 53°, while the third angle x is unknown and we are to find its value.

we know that the sum of angles in a triangle is equal to a total of 180 degrees. so we can write it as:

x + 62° + 53° = 180°

solving to find the value of x:

x = 180 - (62 + 53) = 65°

therefore, the value of x in this triangle is 65°.

3x^3-x^2+6x-9