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x in (-oo:+oo)
(1/2)*(7*x+15) = -x/4 // + -x/4
(1/2)*(7*x+15)-(-x/4) = 0
(1/2)*(7*x+15)+(1/4)*x = 0
1/2*(7*x+15)+x/4 = 0
(1/2*4*(7*x+15))/4+x/4 = 0
1/2*4*(7*x+15)+x = 0
15*x+30 = 0
(15*x+30)/4 = 0
(15*x+30)/4 = 0 // * 4
15*x+30 = 0
15*x+30 = 0 // - 30
15*x = -30 // : 15
x = -30/15
x = -2
x = -2
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