How do you find the x of the two equations?

Subtract both equations creating a quadratic. So it is x^2 -4x -12=0, (x-6)(x+2)=0. X equals positive 6 or negative 2. I hope this helps. Could I possibly get brainliest?

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

right

step-by-step explanation: