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4x + (28x -2) is not an equation. It doesn't ask a question, so it doesn't need answering or solving. The expression stands for a number. In order to know the number, you first have to know what number 'x' is.
68 + 28x - 28 = 236 28x + 68 - 68 -28 + 28 = 236 - 68 + 28 28x = 196 x = 7
I assume that is (7x-2)^2 = 16 (7x-2)(7x-2) = 16 49x2 -28x +4 = 16 49x2-28x-12=0 use quadratic formula x = ( -b +/-sqrt(b2-4ac) ) /2a x = -2/7
The sum is 28x
7x+7=28x 28x-7x=7 21x=7 x=3