6x+7=8x-15-6x -6x7= 2x - 15+15 +1522=2x2x/2 22/2=111 st step :isolate or subtract 6 in both sides as shown above.You subtract because you do the opposite of adding.2nd step: the 6x you subtracted on the left side gets canceled. Than you bring the other numbers down so 7=2x-15.After, that isolate or add 15 in both sides as shown above. You will get 22=2x3rd step: You need x by itself so divide 2 in each side as shown above.4 th step : the answer is 11I hope I helped...

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